If the screen is working, you can restore all settings to their original factory defaults through the system settings. : Open the Settings menu from the home screen.
The unit will reboot and clear temporary glitches, though it may not wipe all user data like a menu-based factory reset would. Tips for Success grundig gx3800 factory reset code better
If prompted for a password to enter developer or factory menus, common codes for these head units include (default Bluetooth PIN), thansen.dk Troubleshooting & Tips If the screen is working, you can restore
or 1617 (Common for deeper "Factory Settings" menus) [3, 5] How to Perform a Factory Reset Tips for Success If prompted for a password
Many users encounter a prompt for a when trying to access advanced "Factory Settings" (often used for camera or firmware adjustments). Official documentation for the GX-3800 does not explicitly list this password, leading many to believe it is reserved for factory technicians.