If you are prompted for a code to enter the "Factory Settings" menu (often used for remapping steering wheel controls or changing boot logos), Grundig systems frequently use standard industry defaults: (Most common for Grundig/Android head units) 1234 123456 1617 0000 Troubleshooting Tips
Power on the unit and tap the icon on the home screen. Navigate to the General or System tab. Scroll down to find the Factory Default or Reset option. grundig gx-3800 factory reset code
If the screen is frozen or black, a hard reset is necessary: If you are prompted for a code to