diff --git a/CONTRIBUTIONS.md b/CONTRIBUTIONS.md
index 0b35c40e..55d2205b 100644
--- a/CONTRIBUTIONS.md
+++ b/CONTRIBUTIONS.md
@@ -21,6 +21,7 @@ for details!
 * [Ben Harris](mailto:mail@bharr.is) (@bharrisau)
 * [Daniel Ziegenberg](mailto:daniel@ziegenberg.at) (@ziegenberg)
 * [Ignacio Serrano](mailto:ignic@ignic.com) (@ignic)
+* [Ilya Kulakov](mailto:kulakov.ilya@gmail.com) (@Kentzo)
 * [Michael Gisbers](mailto:michael@gisbers.de) (@mgisbers)
 * [Miquel Bonastre](mailto:mbonastre@yahoo.com) (@mbonastre)
 * @netravnen
diff --git a/INITIAL-COMMANDS.md b/INITIAL-COMMANDS.md
index 8b64d281..65b313b5 100644
--- a/INITIAL-COMMANDS.md
+++ b/INITIAL-COMMANDS.md
@@ -17,23 +17,33 @@ Initial commands
 Run the complete base installation:
 
     {
-      /tool/fetch "https://git.eworm.de/cgit/routeros-scripts/plain/certs/ISRG-Root-X2.pem" dst-path="isrg-root-x2.pem" as-value;
+      :local BaseUrl "https://git.eworm.de/cgit/routeros-scripts/plain/";
+      :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="isrg-root-x2.pem" passphrase="";
-      :if ([ :len [ /certificate/find where fingerprint="69729b8e15a86efc177a57afb7171dfc64add28c2fca8cf1507e34453ccb1470" ] ] != 1) do={
+      /certificate/import file-name=$CertFileName passphrase="";
+      :if ([ :len [ /certificate/find where fingerprint=$CertFingerprint ] ] != 1) do={
         :error "Something is wrong with your certificates!";
       };
       :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={
+        :put "Installing $Script...";
         /system/script/remove [ find where name=$Script ];
-        /system/script/add name=$Script owner=$Script source=([ /tool/fetch check-certificate=yes-without-crl ("https://git.eworm.de/cgit/routeros-scripts/plain/" . $Script . ".rsc") output=user as-value]->"data");
+        /system/script/add name=$Script owner=$Script source=([ /tool/fetch check-certificate=yes-without-crl ($BaseUrl . $Script . ".rsc") output=user as-value]->"data");
       };
+      :put "Loading configuration and functions...";
       /system/script { run global-config; run global-functions; };
+      :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 "ISRG Root X2";
+      $CertificateNameByCN $CertFingerprint;
     };
 
 Then continue setup with
diff --git a/global-functions.rsc b/global-functions.rsc
index 8ade79bf..d0145676 100644
--- a/global-functions.rsc
+++ b/global-functions.rsc
@@ -167,8 +167,8 @@
     $LogPrint warning $0 ("Failed downloading certificate with CommonName '" . $CommonName . \
       "' from repository! Trying fallback to mkcert.org...");
     :do {
-      :if ([ $CertificateAvailable "ISRG Root X1" ] = false) do={
-        $LogPrint error $0 ("Downloading required certificate failed.");
+      :if ([ :len [ /certificate/find where common-name="ISRG Root X1" ] ] = 0) do={
+        $LogPrint error $0 ("Required certificate is not available.");
         :return false;
       }
       /tool/fetch check-certificate=yes-without-crl http-header-field=({ [ $FetchUserAgentStr $0 ] }) \
@@ -203,12 +203,17 @@
 
 # name a certificate by its common-name
 :set CertificateNameByCN do={
-  :local CommonName [ :tostr $1 ];
+  :local Match [ :tostr $1 ];
 
   :global CleanName;
 
-  :local Cert [ /certificate/find where common-name=$CommonName ];
+  :local Cert ([ /certificate/find where (common-name=$Match or fingerprint=$Match or name=$Match) ]->0);
+  :if ([ :len $Cert ] = 0) do={
+    :return false;
+  }
+  :local CommonName [ /certificate/get $Cert common-name ];
   /certificate/set $Cert name=[ $CleanName $CommonName ];
+  :return true;
 }
 
 # multiply given character(s)
@@ -1387,8 +1392,8 @@
 
 # lock script against multiple invocation
 :set ScriptLock do={
-  :local Script   [ :tostr $1 ];
-  :local WaitMax ([ :tonum $3 ] * 10);
+  :local Script  [ :tostr  $1 ];
+  :local WaitMax [ :totime $2 ];
 
   :global GetRandom20CharAlNum;
   :global IfThenElse;
@@ -1477,6 +1482,10 @@
     :set ($ScriptLockOrder->$Script) ({});
   }
 
+  :if ([ :typeof $WaitMax ] = "nil" ) do={
+    :set WaitMax 0s;
+  }
+
   :if ([ :len [ /system/script/find where name=$Script ] ] = 0) do={
     $LogPrint error $0 ("A script named '" . $Script . "' does not exist!");
     :error false;
@@ -1496,12 +1505,13 @@
   :local MyTicket [ $GetRandom20CharAlNum 6 ];
   $AddTicket $Script $MyTicket;
 
-  :local WaitCount 0;
-  :while ($WaitMax > $WaitCount && \
+  :local WaitInterval ($WaitMax / 20);
+  :local WaitTime $WaitMax;
+  :while ($WaitTime > 0 && \
       ([ $IsFirstTicket $Script $MyTicket ] = false || \
       [ $TicketCount $Script ] < [ $JobCount $Script ])) do={
-    :set WaitCount ($WaitCount + 1);
-    :delay 100ms;
+    :set WaitTime ($WaitTime - $WaitInterval);
+    :delay $WaitInterval;
   }
 
   :if ([ $IsFirstTicket $Script $MyTicket ] = true && \
@@ -1513,7 +1523,7 @@
 
   $RemoveTicket $Script $MyTicket;
   $LogPrint debug $0 ("Script '" . $Script . "' started more than once" . \
-    [ $IfThenElse ($WaitCount > 0) " and timed out waiting for lock" "" ] . "...");
+    [ $IfThenElse ($WaitTime < $WaitMax) " and timed out waiting for lock" "" ] . "...");
   :return false;
 }