diff --git a/keypadOS.lua b/keypadOS.lua
index a0404f9..5090159 100644
--- a/keypadOS.lua
+++ b/keypadOS.lua
@@ -7,7 +7,7 @@ local require = function(path)
         return __DEFAULT_IMPORT(path)
     end
 end
-
+local KEYPADOS_UPDATE_HASH = "PJIEvsAncSvhKOqsLGVlxvzJ"
 rawset(__BUNDLER_FILES, "updater.lua", function ()
     local utils = require("utils.lua")
     local LAST_USED = os.time()
@@ -26,10 +26,9 @@ rawset(__BUNDLER_FILES, "updater.lua", function ()
                     if string.find(update_code_text, "^local __BUNDLER_FILES = {}") then
                         -- Make backup
                         fs.copy("startup.lua", "backup.lua")
-                        local startup_file = fs.open("startup.lua", "r")
-                        local startup_contents = startup_file.readAll()
-                        startup_file.close()
-                        if update_code_text ~= startup_contents then
+                        local pattern = 'local KEYPADOS_UPDATE_HASH%s*=%s*"(.-)"'
+                        local foundUpdateHash = inputString:match(pattern)
+                        if KEYPADOS_UPDATE_HASH ~= foundUpdateHash then
                             local file = fs.open("startup.lua", "w")
                             file.write(update_code_text)
                             file.close()
@@ -160,13 +159,20 @@ rawset(__BUNDLER_FILES, "ui.lua", function ()
         ui.enterButton = ui.main:addButton()
             :setText(">>>>")
             :setBackground(colors.blue)
-            :setPosition(6,3)
+            :setPosition(6,2)
             :setSize(1.5,3.2)
             :onClick(function()
                 unlockDoor(ui)
             end)
         local btnX = 1
-        local btnY = 3
+        local btnY = 2
+        ui.main:addButton()
+            :setPosition(1, 5)
+            :setText("0")
+            :setSize(6,1)
+            :onClick(function()
+                addToPin(ui, 0)
+            end)
         for i = 1, 9 do
             ui.main:addButton()
                 :setPosition(btnX, btnY)
diff --git a/src/ui.lua b/src/ui.lua
index a3e4c00..d409c86 100644
--- a/src/ui.lua
+++ b/src/ui.lua
@@ -83,14 +83,22 @@ function mod.InitUi()
     ui.enterButton = ui.main:addButton()
         :setText(">>>>")
         :setBackground(colors.blue)
-        :setPosition(6,3)
+        :setPosition(6,2)
         :setSize(1.5,3.2)
         :onClick(function()
             unlockDoor(ui)
         end)
 
     local btnX = 1
-    local btnY = 3
+    local btnY = 2
+
+    ui.main:addButton()
+        :setPosition(1, 5)
+        :setText("0")
+        :setSize(6,1)
+        :onClick(function()
+            addToPin(ui, 0)
+        end)
 
     for i = 1, 9 do
         ui.main:addButton()
diff --git a/src/updater.lua b/src/updater.lua
index 2a5d644..092f4d9 100644
--- a/src/updater.lua
+++ b/src/updater.lua
@@ -19,11 +19,10 @@ local function checkForUpdate()
                     -- Make backup
                     fs.copy("startup.lua", "backup.lua")
 
-                    local startup_file = fs.open("startup.lua", "r")
-                    local startup_contents = startup_file.readAll()
-                    startup_file.close()
+                    local pattern = 'local KEYPADOS_UPDATE_HASH%s*=%s*"(.-)"'
+                    local foundUpdateHash = inputString:match(pattern)
 
-                    if update_code_text ~= startup_contents then
+                    if KEYPADOS_UPDATE_HASH ~= foundUpdateHash then
                         local file = fs.open("startup.lua", "w")
                         file.write(update_code_text)
                         file.close()
diff --git a/x.py b/x.py
index 4096655..14978e6 100755
--- a/x.py
+++ b/x.py
@@ -1,5 +1,7 @@
 #!/usr/bin/python
-
+import string
+import random
+UPDATE_ID=  ''.join(random.choices(string.ascii_letters, k=24))
 OUTPUT="keypadOS.lua";
 FILES= [
     "updater.lua",
@@ -31,6 +33,7 @@ def main():
     buf += "        return __DEFAULT_IMPORT(path)\n";
     buf += "    end\n";
     buf += "end\n";
+    buf += f'local KEYPADOS_UPDATE_HASH = "{UPDATE_ID}"';
 
     for file in FILES:
         print(f"=== FILE: {file}");