diff --git a/CONTRIBUTIONS.md b/CONTRIBUTIONS.md
index 5bf5d08..00861c1 100644
--- a/CONTRIBUTIONS.md
+++ b/CONTRIBUTIONS.md
@@ -35,6 +35,7 @@ Add yourself to the list,
 [donate with PayPal ↗️](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=A4ZXBD6YS2W8J)!
 
 * Abdul Mannan Abbasi
+* Alex Maier
 * Andrea Ruffini Perico
 * Andrew Cox
 * Christoph Boss (@Kampfwurst)
diff --git a/INITIAL-COMMANDS.md b/INITIAL-COMMANDS.md
index 79773bd..40f609b 100644
--- a/INITIAL-COMMANDS.md
+++ b/INITIAL-COMMANDS.md
@@ -18,17 +18,21 @@ Run the complete base installation:
 
     {
       :local BaseUrl "https://git.eworm.de/cgit/routeros-scripts/plain/";
+      :local CertCommonName "ISRG Root X2";
       :local CertFileName "ISRG-Root-X2.pem";
       :local CertFingerprint "69729b8e15a86efc177a57afb7171dfc64add28c2fca8cf1507e34453ccb1470";
 
-      :put "Importing certificate...";
-      /tool/fetch ($BaseUrl . "certs/" . $CertFileName) dst-path=$CertFileName as-value;
-      :delay 1s;
-      /certificate/import file-name=$CertFileName passphrase="";
-      :if ([ :len [ /certificate/find where fingerprint=$CertFingerprint ] ] != 1) do={
-        :error "Something is wrong with your certificates!";
+      :if (!(([ /certificate/settings/get ]->"builtin-trust-anchors") = "trusted" && \
+           [[ :parse (":return [ :len [ /certificate/builtin/find where common-name=\"" . $CertCommonName . "\" ] ]") ]] > 0)) do={
+        :put "Importing certificate...";
+        /tool/fetch ($BaseUrl . "certs/" . $CertFileName) dst-path=$CertFileName as-value;
+        :delay 1s;
+        /certificate/import file-name=$CertFileName passphrase="";
+        :if ([ :len [ /certificate/find where fingerprint=$CertFingerprint ] ] != 1) do={
+          :error "Something is wrong with your certificates!";
+        };
+        :delay 1s;
       };
-      :delay 1s;
       :put "Renaming global-config-overlay, if exists...";
       /system/script/set name=("global-config-overlay-" . [ /system/clock/get date ] . "-" . [ /system/clock/get time ]) [ find where name="global-config-overlay" ];
       :foreach Script in={ "global-config"; "global-config-overlay"; "global-functions" } do={
@@ -41,9 +45,11 @@ Run the complete base installation:
       :put "Scheduling to load configuration and functions...";
       /system/scheduler/remove [ find where name="global-scripts" ];
       /system/scheduler/add name="global-scripts" start-time=startup on-event="/system/script { run global-config; run global-functions; }";
-      :put "Renaming certificate by its common-name...";
-      :global CertificateNameByCN;
-      $CertificateNameByCN $CertFingerprint;
+      :if ([ :len [ /certificate/find where fingerprint=$CertFingerprint ] ] > 0) do={
+        :put "Renaming certificate by its common-name...";
+        :global CertificateNameByCN;
+        $CertificateNameByCN $CertFingerprint;
+      };
     };
 
 Then continue setup with
diff --git a/README.md b/README.md
index 2a8b2ce..243e1fc 100644
--- a/README.md
+++ b/README.md
@@ -72,7 +72,15 @@ including demonstation recorded live at [MUM Europe
 ### The long way in detail
 
 The update script does server certificate verification, so first step is to
-download the certificates. If you intend to download the scripts from a
+download the certificates.
+
+> 💡️ **Hint**: RouterOS 7.19 comes with a builtin certificate store. You
+> can skip the steps regarding certificate download and import and jump
+> to [installation of scripts](#installation-of-scripts) if you set the
+> trust for these builtin trust anchors:
+> `/certificate/settings/set builtin-trust-anchors=trusted;`
+
+If you intend to download the scripts from a
 different location (for example from github.com) install the corresponding
 certificate chain.
 
@@ -106,6 +114,8 @@ is shown.
 
 Always make sure there are no certificates installed you do not know or want!
 
+#### Installation of scripts
+
 All following commands will verify the server certificate. For validity the
 certificate's lifetime is checked with local time, so make sure the device's
 date and time is set correctly!
diff --git a/accesslist-duplicates.capsman.rsc b/accesslist-duplicates.capsman.rsc
index 5e6cf0a..1da0366 100644
--- a/accesslist-duplicates.capsman.rsc
+++ b/accesslist-duplicates.capsman.rsc
@@ -22,7 +22,7 @@
   :foreach AccList in=[ /caps-man/access-list/find where mac-address!="00:00:00:00:00:00" ] do={
     :local Mac [ /caps-man/access-list/get $AccList mac-address ];
     :if ($Seen->$Mac = 1) do={
-      /caps-man/access-list/print where mac-address=$Mac;
+      /caps-man/access-list/print without-paging where mac-address=$Mac;
       :local Remove [ :tonum [ /terminal/ask prompt="\nNumeric id to remove, any key to skip!" ] ];
 
       :if ([ :typeof $Remove ] = "num") do={
diff --git a/accesslist-duplicates.local.rsc b/accesslist-duplicates.local.rsc
index a6b4f41..03a9724 100644
--- a/accesslist-duplicates.local.rsc
+++ b/accesslist-duplicates.local.rsc
@@ -22,7 +22,7 @@
   :foreach AccList in=[ /interface/wireless/access-list/find where mac-address!="00:00:00:00:00:00" ] do={
     :local Mac [ /interface/wireless/access-list/get $AccList mac-address ];
     :if ($Seen->$Mac = 1) do={
-      /interface/wireless/access-list/print where mac-address=$Mac;
+      /interface/wireless/access-list/print without-paging where mac-address=$Mac;
       :local Remove [ :tonum [ /terminal/ask prompt="\nNumeric id to remove, any key to skip!" ] ];
 
       :if ([ :typeof $Remove ] = "num") do={
diff --git a/accesslist-duplicates.template.rsc b/accesslist-duplicates.template.rsc
index e51198d..bf23147 100644
--- a/accesslist-duplicates.template.rsc
+++ b/accesslist-duplicates.template.rsc
@@ -27,9 +27,9 @@
     :local Mac [ /interface/wifi/access-list/get $AccList mac-address ];
     :local Mac [ /interface/wireless/access-list/get $AccList mac-address ];
     :if ($Seen->$Mac = 1) do={
-      /caps-man/access-list/print where mac-address=$Mac;
-      /interface/wifi/access-list/print where mac-address=$Mac;
-      /interface/wireless/access-list/print where mac-address=$Mac;
+      /caps-man/access-list/print without-paging where mac-address=$Mac;
+      /interface/wifi/access-list/print without-paging where mac-address=$Mac;
+      /interface/wireless/access-list/print without-paging where mac-address=$Mac;
       :local Remove [ :tonum [ /terminal/ask prompt="\nNumeric id to remove, any key to skip!" ] ];
 
       :if ([ :typeof $Remove ] = "num") do={
diff --git a/accesslist-duplicates.wifi.rsc b/accesslist-duplicates.wifi.rsc
index cadacb6..528a73c 100644
--- a/accesslist-duplicates.wifi.rsc
+++ b/accesslist-duplicates.wifi.rsc
@@ -22,7 +22,7 @@
   :foreach AccList in=[ /interface/wifi/access-list/find where mac-address!="00:00:00:00:00:00" ] do={
     :local Mac [ /interface/wifi/access-list/get $AccList mac-address ];
     :if ($Seen->$Mac = 1) do={
-      /interface/wifi/access-list/print where mac-address=$Mac;
+      /interface/wifi/access-list/print without-paging where mac-address=$Mac;
       :local Remove [ :tonum [ /terminal/ask prompt="\nNumeric id to remove, any key to skip!" ] ];
 
       :if ([ :typeof $Remove ] = "num") do={
diff --git a/backup-email.rsc b/backup-email.rsc
index 632d2e6..8015bea 100644
--- a/backup-email.rsc
+++ b/backup-email.rsc
@@ -27,6 +27,7 @@
 
   :global CleanName;
   :global DeviceInfo;
+  :global FileExists;
   :global FormatLine;
   :global LogPrint;
   :global MkDir;
@@ -124,17 +125,19 @@
     attach=$Attach; remove-attach=true });
 
   # wait for the mail to be sent
-  :local I 0;
-  :while ([ :len [ /file/find where name ~ ($FilePath . "\\.(backup|rsc)\$") ] ] > 0) do={
-    :if ($I >= 120) do={
-      $LogPrint warning $ScriptName ("Files are still available, sending e-mail failed.");
-      :set PackagesUpdateBackupFailure true;
-      :set ExitOK true;
-      :error false;
-    }
-    :delay 1s;
-    :set I ($I + 1);
+  :do {
+    :retry {
+      :if ([ $FileExists ($FilePath . ".conf") ".conf file" ] = true || \
+           [ $FileExists ($FilePath . ".backup") "backup" ] = true || \
+           [ $FileExists ($FilePath . ".rsc") "script" ] = true) do={
+        :error "Files are still available.";
+      }
+    } delay=1s max=120;
+  } on-error={
+    $LogPrint warning $ScriptName ("Files are still available, sending e-mail failed.");
+    :set PackagesUpdateBackupFailure true;
   }
+  # do not remove the files here, as the mail is still queued!
 } do={
   :global ExitError; $ExitError $ExitOK [ :jobname ] $Err;
 }
diff --git a/capsman-download-packages.capsman.rsc b/capsman-download-packages.capsman.rsc
index cab1e4c..2ea1667 100644
--- a/capsman-download-packages.capsman.rsc
+++ b/capsman-download-packages.capsman.rsc
@@ -20,6 +20,7 @@
 
   :global CleanFilePath;
   :global DownloadPackage;
+  :global FileGet;
   :global LogPrint;
   :global MkDir;
   :global RmFile;
@@ -42,7 +43,7 @@
     :error false;
   }
 
-  :if ([ :len [ /file/find where name=$PackagePath type="directory" ] ] = 0) do={
+  :if ([ $FileGet $PackagePath ] = false) do={
     :if ([ $MkDir $PackagePath ] = false) do={
       $LogPrint warning $ScriptName ("Creating directory at CAPsMAN package path (" . \
         $PackagePath . ") failed!");
@@ -53,7 +54,7 @@
       "). Please place your packages!");
   }
 
-  :foreach Package in=[ /file/find where type=package \
+  :foreach Package in=[ /file/find where type="package" \
         package-version!=$InstalledVersion name~("^" . $PackagePath) ] do={
     :local File [ /file/get $Package ];
     :if ($File->"package-architecture" = "mips") do={
@@ -66,7 +67,7 @@
     }
   }
 
-  :if ([ :len [ /file/find where type=package name~("^" . $PackagePath) ] ] = 0) do={
+  :if ([ :len [ /file/find where type="package" name~("^" . $PackagePath) ] ] = 0) do={
     $LogPrint info $ScriptName ("No packages available, downloading default set.");
     :foreach Arch in={ "arm"; "mipsbe" } do={
       :foreach Package in={ "routeros"; "wireless" } do={
diff --git a/capsman-download-packages.template.rsc b/capsman-download-packages.template.rsc
index ea41120..f95212a 100644
--- a/capsman-download-packages.template.rsc
+++ b/capsman-download-packages.template.rsc
@@ -21,6 +21,7 @@
 
   :global CleanFilePath;
   :global DownloadPackage;
+  :global FileGet;
   :global LogPrint;
   :global MkDir;
   :global RmFile;
@@ -44,7 +45,7 @@
     :error false;
   }
 
-  :if ([ :len [ /file/find where name=$PackagePath type="directory" ] ] = 0) do={
+  :if ([ $FileGet $PackagePath ] = false) do={
     :if ([ $MkDir $PackagePath ] = false) do={
       $LogPrint warning $ScriptName ("Creating directory at CAPsMAN package path (" . \
         $PackagePath . ") failed!");
@@ -55,7 +56,7 @@
       "). Please place your packages!");
   }
 
-  :foreach Package in=[ /file/find where type=package \
+  :foreach Package in=[ /file/find where type="package" \
         package-version!=$InstalledVersion name~("^" . $PackagePath) ] do={
     :local File [ /file/get $Package ];
     :if ($File->"package-architecture" = "mips") do={
@@ -68,7 +69,7 @@
     }
   }
 
-  :if ([ :len [ /file/find where type=package name~("^" . $PackagePath) ] ] = 0) do={
+  :if ([ :len [ /file/find where type="package" name~("^" . $PackagePath) ] ] = 0) do={
     $LogPrint info $ScriptName ("No packages available, downloading default set.");
 # NOT /interface/wifi/ #
     :foreach Arch in={ "arm"; "mipsbe" } do={
diff --git a/capsman-download-packages.wifi.rsc b/capsman-download-packages.wifi.rsc
index a810356..03fd9e7 100644
--- a/capsman-download-packages.wifi.rsc
+++ b/capsman-download-packages.wifi.rsc
@@ -20,6 +20,7 @@
 
   :global CleanFilePath;
   :global DownloadPackage;
+  :global FileGet;
   :global LogPrint;
   :global MkDir;
   :global RmFile;
@@ -42,7 +43,7 @@
     :error false;
   }
 
-  :if ([ :len [ /file/find where name=$PackagePath type="directory" ] ] = 0) do={
+  :if ([ $FileGet $PackagePath ] = false) do={
     :if ([ $MkDir $PackagePath ] = false) do={
       $LogPrint warning $ScriptName ("Creating directory at CAPsMAN package path (" . \
         $PackagePath . ") failed!");
@@ -53,7 +54,7 @@
       "). Please place your packages!");
   }
 
-  :foreach Package in=[ /file/find where type=package \
+  :foreach Package in=[ /file/find where type="package" \
         package-version!=$InstalledVersion name~("^" . $PackagePath) ] do={
     :local File [ /file/get $Package ];
     :if ($File->"package-architecture" = "mips") do={
@@ -66,7 +67,7 @@
     }
   }
 
-  :if ([ :len [ /file/find where type=package name~("^" . $PackagePath) ] ] = 0) do={
+  :if ([ :len [ /file/find where type="package" name~("^" . $PackagePath) ] ] = 0) do={
     $LogPrint info $ScriptName ("No packages available, downloading default set.");
     :foreach Arch in={ "arm"; "arm64" } do={
       :local Packages { "arm"={ "routeros"; "wifi-qcom"; "wifi-qcom-ac" };
diff --git a/check-routeros-update.rsc b/check-routeros-update.rsc
index e28a019..8b80dde 100644
--- a/check-routeros-update.rsc
+++ b/check-routeros-update.rsc
@@ -28,6 +28,7 @@
   :global EscapeForRegEx;
   :global FetchUserAgentStr;
   :global LogPrint;
+  :global RebootForUpdate;
   :global ScriptFromTerminal;
   :global ScriptLock;
   :global SendNotification2;
@@ -62,9 +63,14 @@
   $WaitFullyConnected;
 
   :if ([ :len [ /system/scheduler/find where name="_RebootForUpdate" ] ] > 0) do={
-    $LogPrint info $ScriptName ("A reboot for update is already scheduled.");
-    :set ExitOK true;
-    :error false;
+    :if ([ :typeof $RebootForUpdate ] = "nothing") do={
+      $LogPrint info $ScriptName ("Found a stale scheduler for reboot, removing.");
+      /system/scheduler/remove "_RebootForUpdate";
+    } else={
+      $LogPrint info $ScriptName ("A reboot for update is already scheduled.");
+      :set ExitOK true;
+      :error false;
+    }
   }
 
   $LogPrint debug $ScriptName ("Checking for updates...");
diff --git a/doc/fw-addr-lists.md b/doc/fw-addr-lists.md
index d09383b..46b80c2 100644
--- a/doc/fw-addr-lists.md
+++ b/doc/fw-addr-lists.md
@@ -32,7 +32,10 @@ certificate is checked.
 
 > ⚠️ **Warning**: The script does not limit the size of a list, but keep in
 > mind that huge lists can exhaust your device's resources (RAM and CPU),
-> and may take a long time to process.
+> and may take a long time to process.  
+> Even crashes for the complete scripting (and CLI) subsystem are possible.
+> This should be logged accordingly with warnings when global functions are
+> reloaded from scheduler.
 
 Requirements and installation
 -----------------------------
diff --git a/doc/packages-update.md b/doc/packages-update.md
index 75225fe..a0a1795 100644
--- a/doc/packages-update.md
+++ b/doc/packages-update.md
@@ -46,8 +46,8 @@ Configuration
 
 The configuration goes to `global-config-overlay`, this is the only parameter:
 
-* `PackagesUpdateDeferReboot`: defer the reboot for night (between 3 AM
-  and 5 AM)
+* `PackagesUpdateDeferReboot`: defer the reboot for night (between 3 AM and
+  5 AM), use a numerical value in days suffixed with a `d` to defer further
 
 By modifying the scheduler's `start-time` you can force the reboot at
 different time.
diff --git a/fw-addr-lists.rsc b/fw-addr-lists.rsc
index efd37db..0c45f7e 100644
--- a/fw-addr-lists.rsc
+++ b/fw-addr-lists.rsc
@@ -48,6 +48,12 @@
   }
   $WaitFullyConnected;
 
+  :if ([ :len [ /log/find where topics=({"script"; "warning"}) \
+      message=("\$LogPrintOnce: The message is already in log, scripting subsystem may have crashed before!") ] ] > 0) do={
+    $LogPrintOnce warning $ScriptName ("Scripting subsystem may have crashed, possibly caused by us. Delaying!");
+    :delay 5m;
+  }
+
   :local ListComment ("managed by " . $ScriptName);
 
   :foreach FwListName,FwList in=$FwAddrLists do={
diff --git a/global-functions.rsc b/global-functions.rsc
index ef849e0..829cbf2 100644
--- a/global-functions.rsc
+++ b/global-functions.rsc
@@ -38,6 +38,8 @@
 :global ExitError;
 :global FetchHuge;
 :global FetchUserAgentStr;
+:global FileExists;
+:global FileGet;
 :global FormatLine;
 :global FormatMultiLines;
 :global GetMacVendor;
@@ -119,6 +121,11 @@
     :return false;
   }
 
+  :if (([ /certificate/settings/get ]->"builtin-trust-anchors") = "trusted" && \
+       [[ :parse (":return [ :len [ /certificate/builtin/find where common-name=\"" . $CommonName . "\" ] ]") ]] > 0) do={
+    :return true;
+  }
+
   :if ([ :len [ /certificate/find where common-name=$CommonName ] ] = 0) do={
     $LogPrint info $0 ("Certificate with CommonName '" . $CommonName . "' not available.");
     :if ([ $CertificateDownload $CommonName ] = false) do={
@@ -358,6 +365,7 @@
 
   :global CertificateAvailable;
   :global CleanFilePath;
+  :global FileExists;
   :global LogPrint;
   :global MkDir;
   :global RmFile;
@@ -378,7 +386,7 @@
     :return false;
   }
 
-  :if ([ :len [ /file/find where name=$PkgDest type="package" ] ] > 0) do={
+  :if ([ $FileExists $PkgDest "package" ] = true) do={
     $LogPrint info $0 ("Package file " . $PkgName . " already exists.");
     :return true;
   }
@@ -400,7 +408,7 @@
     :return false;
   }
 
-  :if ([ /file/get [ find where name=$PkgDest ] type ] != "package") do={
+  :if ([ $FileExists $PkgDest "package" ] = false) do={
     $LogPrint warning $0 ("Downloaded file is not a package, removing.");
     $RmFile $PkgDest;
     :return false;
@@ -524,6 +532,47 @@
     $Resource->"architecture-name" . " " . $Caller . "/Fetch (https://rsc.eworm.de/)");
 }
 
+# check for existence of file, optionally with type
+:set FileExists do={
+  :local FileName [ :tostr $1 ];
+  :local Type     [ :tostr $2 ];
+
+  :global FileGet;
+
+  :local FileVal [ $FileGet $FileName ];
+  :if ($FileVal = false) do={
+    :return false;
+  }
+
+  :if ([ :len ($FileVal->"size") ] = 0) do={
+    :return false;
+  }
+
+  :if ([ :len $Type ] = 0 || $FileVal->"type" = $Type) do={
+    :return true;
+  }
+
+  :return false;
+}
+
+# get file properties in array, or false on error
+:set FileGet do={
+  :local FileName [ :tostr $1 ];
+
+  :global WaitForFile;
+
+  :if ([ $WaitForFile $FileName 0s ] = false) do={
+    :return false;
+  }
+
+  :local FileVal false;
+  :do {
+    :set FileVal [ /file/get $FileName ];
+  } on-error={ }
+
+  :return $FileVal;
+}
+
 # format a line for output
 :set FormatLine do={
   :local Key    [ :tostr $1 ];
@@ -875,6 +924,7 @@
   :local Path [ :tostr $1 ];
 
   :global CleanFilePath;
+  :global FileGet;
   :global LogPrint;
   :global RmDir;
   :global WaitForFile;
@@ -912,7 +962,8 @@
 
   $LogPrint debug $0 ("Making directory: " . $Path);
 
-  :if ([ :len [ /file/find where name=$Path type="directory" ] ] = 1) do={
+  :local PathVal [ $FileGet $Path ];
+  :if ($PathVal->"type" = "directory") do={
     $LogPrint debug $0 ("... which already exists.");
     :return true;
   }
@@ -1037,25 +1088,26 @@
 :set RmDir do={
   :local DirName [ :tostr $1 ];
 
+  :global FileGet;
   :global LogPrint;
 
   $LogPrint debug $0 ("Removing directory: ". $DirName);
 
-  :if ([ :len [ /file/find where name=$DirName type!=directory ] ] > 0) do={
-    $LogPrint error $0 ("Directory '" . $DirName . "' is not a directory.");
-    :return false;
-  }
-
-  :local Dir [ /file/find where name=$DirName type=directory ];
-  :if ([ :len $Dir ] = 0) do={
+  :local DirVal [ $FileGet $DirName ];
+  :if ($DirVal = false) do={
     $LogPrint debug $0 ("... which does not exist.");
     :return true;
   }
 
+  :if ($DirVal->"type" != "directory") do={
+    $LogPrint error $0 ("Directory '" . $DirName . "' is not a directory.");
+    :return false;
+  }
+
   :onerror Err {
-    /file/remove $Dir;
+    /file/remove $DirName;
   } do={
-    $LogPrint error $0 ("Removing directory '" . $DirName . "' (" . $Dir . ") failed: " . $Err);
+    $LogPrint error $0 ("Removing directory '" . $DirName . "' failed: " . $Err);
     :return false;
   }
   :return true;
@@ -1065,25 +1117,26 @@
 :set RmFile do={
   :local FileName [ :tostr $1 ];
 
+  :global FileGet;
   :global LogPrint;
 
   $LogPrint debug $0 ("Removing file: ". $FileName);
 
-  :if ([ :len [ /file/find where name=$FileName (type=directory or type=disk) ] ] > 0) do={
-    $LogPrint error $0 ("File '" . $FileName . "' is not a file.");
-    :return false;
-  }
-
-  :local File [ /file/find where name=$FileName !(type=directory or type=disk) ];
-  :if ([ :len $File ] = 0) do={
+  :local FileVal [ $FileGet $FileName ];
+  :if ($FileVal = false) do={
     $LogPrint debug $0 ("... which does not exist.");
     :return true;
   }
 
+  :if ($FileVal->"type" = "directory" || $FileVal->"type" = "disk") do={
+    $LogPrint error $0 ("File '" . $FileName . "' is not a file.");
+    :return false;
+  }
+
   :onerror Err {
-    /file/remove $File;
+    /file/remove $FileName;
   } do={
-    $LogPrint error $0 ("Removing file '" . $FileName . "' (" . $File . ") failed: " . $Err);
+    $LogPrint error $0 ("Removing file '" . $FileName . "' failed: " . $Err);
     :return false;
   }
   :return true;
@@ -1212,7 +1265,7 @@
           :set SourceNew [ :tolf ($Result->"data") ];
         }
       } do={
-        $LogPrint warning $0 ("Failed fetching script '" . $ScriptVal->"name" . . "': " . $Err);
+        $LogPrint warning $0 ("Failed fetching script '" . $ScriptVal->"name" . "': " . $Err);
         :if ($ScriptVal->"source" = "#!rsc by RouterOS\n") do={
           $LogPrint warning $0 ("Removing dummy. Typo on installation?");
           /system/script/remove $Script;
@@ -1724,15 +1777,16 @@
   :global MAX;
 
   :set FileName [ $CleanFilePath $FileName ];
-  :local I 1;
-  :local Delay ([ $MAX [ $EitherOr $WaitTime 2s ] 100ms ] / 10);
+  :local Delay ([ $MAX [ $EitherOr $WaitTime 2s ] 100ms ] / 9);
 
-  :while ([ :len [ /file/find where name=$FileName ] ] = 0) do={
-    :if ($I >= 10) do={
-      :return false;
-    }
-    :delay $Delay;
-    :set I ($I + 1);
+  :do {
+    :retry { 
+      :if ([ :len [ /file/find where name=$FileName ] ] = 0) do={
+        :error false;
+      }
+    } delay=$Delay max=10;
+  } on-error={
+    :return false;
   }
 
   :while ([ :len [ /file/find where name=$FileName ] ] > 0) do={
diff --git a/mod/notification-email.rsc b/mod/notification-email.rsc
index 5293766..ad9762a 100644
--- a/mod/notification-email.rsc
+++ b/mod/notification-email.rsc
@@ -40,9 +40,11 @@
 
   :global EitherOr;
   :global EMailGenerateFrom;
+  :global FileExists;
   :global IsDNSResolving;
   :global IsTimeSync;
   :global LogPrint;
+  :global RmFile;
 
   :local AllDone true;
   :local QueueLen [ :len $EmailQueue ];
@@ -93,7 +95,7 @@
       :onerror Err {
         :local Attach ({});
         :foreach File in=[ :toarray [ $EitherOr ($Message->"attach") "" ] ] do={
-          :if ([ :len [ /file/find where name=$File ] ] = 1) do={
+          :if ([ $FileExists $File ] = true) do={
             :set Attach ($Attach, $File);
           } else={
             $LogPrint warning $0 ("File '" . $File . "' does not exist, can not attach.");
@@ -110,7 +112,7 @@
             :set Wait false;
             :if (($Message->"remove-attach") = true) do={
               :foreach File in=$Attach do={
-                /file/remove $File;
+                $RmFile $File;
               }
             }
           }
diff --git a/mod/ssh-keys-import.rsc b/mod/ssh-keys-import.rsc
index 9467525..7bdc95d 100644
--- a/mod/ssh-keys-import.rsc
+++ b/mod/ssh-keys-import.rsc
@@ -75,6 +75,7 @@
   :local User     [ :tostr $2 ];
 
   :global EitherOr;
+  :global FileExists;
   :global LogPrint;
   :global ParseKeyValueStore;
   :global SSHKeysImport;
@@ -84,8 +85,7 @@
     :return false;
   }
 
-  :local File [ /file/find where name=$FileName ];
-  :if ([ :len $File ] = 0) do={
+  :if ([ $FileExists $FileName ] = true) do={
     $LogPrint warning $0 ("File '" . $FileName . "' does not exist.");
     :return false;
   }
diff --git a/netwatch-dns.rsc b/netwatch-dns.rsc
index 4fa076a..9e2f9bc 100644
--- a/netwatch-dns.rsc
+++ b/netwatch-dns.rsc
@@ -119,11 +119,13 @@
 
     :local Data false;
     :onerror Err {
-      :set Data ([ /tool/fetch check-certificate=yes-without-crl output=user \
-        http-header-field=({ "accept: application/dns-message" }) \
-        url=(($DohServer->"doh-url") . "?dns=" . [ :convert to=base64 ([ :rndstr length=2 ] . \
-        "\01\00" . "\00\01" . "\00\00" . "\00\00" . "\00\00" . "\09doh-check\05eworm\02de\00" . \
-        "\00\10" . "\00\01") ]) as-value ]->"data");
+      :retry {
+        :set Data ([ /tool/fetch check-certificate=yes-without-crl output=user \
+          http-header-field=({ "accept: application/dns-message" }) \
+          url=(($DohServer->"doh-url") . "?dns=" . [ :convert to=base64 ([ :rndstr length=2 ] . \
+          "\01\00" . "\00\01" . "\00\00" . "\00\00" . "\00\00" . "\09doh-check\05eworm\02de\00" . \
+          "\00\10" . "\00\01") ]) as-value ]->"data");
+      } delay=1s max=3;
     } do={
       $LogPrint warning $ScriptName ("Request to DoH server " . ($DohServer->"doh-url") . \
           " failed: " . $Err);
diff --git a/packages-update.rsc b/packages-update.rsc
index 4fde131..d3140f2 100644
--- a/packages-update.rsc
+++ b/packages-update.rsc
@@ -31,19 +31,25 @@
   :local Schedule do={
     :local ScriptName [ :tostr $1 ];
 
+    :global PackagesUpdateDeferReboot;
+
     :global GetRandomNumber;
+    :global IfThenElse;
     :global LogPrint;
 
     :global RebootForUpdate do={
       /system/reboot;
     }
 
+    :local Interval [ $IfThenElse ([ :totime $PackagesUpdateDeferReboot ] >= 1d) \
+        $PackagesUpdateDeferReboot 1d ];
     :local StartTime [ :tostr [ :totime (10800 + [ $GetRandomNumber 7200 ]) ] ];
-    /system/scheduler/add name="_RebootForUpdate" start-time=$StartTime interval=1d \
+    /system/scheduler/add name="_RebootForUpdate" start-time=$StartTime interval=$Interval \
         on-event=("/system/scheduler/remove \"_RebootForUpdate\"; " . \
         ":global RebootForUpdate; \$RebootForUpdate;");
     $LogPrint info $ScriptName ("Scheduled reboot for update at " . $StartTime . \
-        " local time (" . [ /system/clock/get time-zone-name ] . ").");
+        " local time (" . [ /system/clock/get time-zone-name ] . ")" . \
+        [ $IfThenElse ($Interval > 1d) (" deferred by " . $Interval) ] . ".");
     :return true;
   }
 
@@ -153,7 +159,7 @@
       :error true;
     }
   } else={
-    :if ($PackagesUpdateDeferReboot = true) do={
+    :if ($PackagesUpdateDeferReboot = true || [ :totime $PackagesUpdateDeferReboot ] >= 1d) do={
       $Schedule $ScriptName;
       :set ExitOK true;
       :error true;
diff --git a/telegram-chat.rsc b/telegram-chat.rsc
index 277c40f..7f7b7a7 100644
--- a/telegram-chat.rsc
+++ b/telegram-chat.rsc
@@ -30,6 +30,7 @@
   :global CertificateAvailable;
   :global EitherOr;
   :global EscapeForRegEx;
+  :global FileExists;
   :global GetRandom20CharAlNum;
   :global IfThenElse;
   :global LogPrint;
@@ -100,7 +101,7 @@
     $LogPrintVerbose debug $ScriptName ("Update " . $UpdateID . ": " . [ :serialize to=json $Update ]);
 
     :local Message ($Update->"message");
-    :local IsReply ([ :typeof ($Message->"reply_to_message") ] = "string");
+    :local IsAnyReply ([ :typeof ($Message->"reply_to_message") ] = "array");
     :local IsMyReply ($TelegramMessageIDs->[ :tostr ($Message->"reply_to_message"->"message_id") ]);
     :if (($IsMyReply = 1 || $TelegramChatOffset->0 > 0 || $Uptime > 5m) && $UpdateID >= $TelegramChatOffset->2) do={
       :local Trusted false;
@@ -138,7 +139,7 @@
             " from update " . $UpdateID . "!");
           :set Done true;
         }
-        :if ($Done = false && ($IsMyReply = 1 || ($IsReply = false && \
+        :if ($Done = false && ($IsMyReply = 1 || ($IsAnyReply = false && \
              $TelegramChatActive = true)) && [ :len $Command ] > 0) do={
           :if ([ $ValidateSyntax $Command ] = true) do={
             :local State "";
@@ -154,7 +155,7 @@
             :if ([ $WaitForFile ($File . ".done") [ $EitherOr $TelegramChatRunTime 20s ] ] = false) do={
               :set State ([ $SymbolForNotification "warning-sign" ] . "The command did not finish, still running in background.\n\n");
             }
-            :if ([ :len [ /file/find where name=($File . ".failed") ] ] > 0) do={
+            :if ([ $FileExists ($File . ".failed") ] = true) do={
               :set State ([ $SymbolForNotification "cross-mark" ] . "The command failed with an error!\n\n");
             }
             :local Content ([ /file/read chunk-size=32768 file=$File as-value ]->"data");