diff --git a/doc/POST_UPGRADE.md b/doc/POST_UPGRADE.md
deleted file mode 100644
index d242cf5..0000000
--- a/doc/POST_UPGRADE.md
+++ /dev/null
@@ -1,19 +0,0 @@
-## You need now to finalize the upgrade process of ZwiiCMS directly in the app.
-
-#### 1. Login with your admin account
-
-#### 2. Go to setup page
-
-![Setup menu](./upgrade_process_1.png)
-
-#### 3. Click on Reinstall
-
-![Reinstall](./upgrade_process_2.png)
-
-#### 4. If needed, deactivate the maintenance mode
-
-![Maintenance mode](./upgrade_process_3.png)
-
-#### 5. Save
-
-![Save](./upgrade_process_4.png)
diff --git a/doc/PRE_UPGRADE.md b/doc/PRE_UPGRADE.md
deleted file mode 100644
index 931aa61..0000000
--- a/doc/PRE_UPGRADE.md
+++ /dev/null
@@ -1,6 +0,0 @@
-## Disclaimers / important information
-By continuing the app will stay in **maintenance mode** until a manual finalization.
-
-The manual finalization process is easy. You just need to be able to access the webapp and login with your admin account.
-
-This process will be explain at the end of the upgarde proccess.
diff --git a/doc/upgrade_process_1.png b/doc/upgrade_process_1.png
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diff --git a/doc/upgrade_process_3.png b/doc/upgrade_process_3.png
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diff --git a/doc/upgrade_process_4.png b/doc/upgrade_process_4.png
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diff --git a/scripts/upgrade b/scripts/upgrade
index 1f7ae2f..73247ce 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -34,8 +34,8 @@ find "$install_dir" -type d -exec chmod +s {} \;
 # UPDATE A CONFIG FILE
 #=================================================
 
-# Apply maintenance mode
-sed -i 's/"maintenance":[^,]*/"maintenance":true/g' "$install_dir/site/data/config.json"
+# Remove updateAvailable flag
+sed -i 's/"updateAvailable":[^,}]*/"updateAvailable":false/g' "$install_dir/site/data/core.json"
 
 #=================================================
 # REAPPLY SYSTEM CONFIGURATIONS