This forces a low-level format of the security sector. After this, any code (e.g., 0000 ) will work.
It is important to remember that a factory reset is a "nuclear option." It will fix your software glitches, but it comes at a cost: grundig gx3800 factory reset code fixed
Use this method if you can still navigate the touchscreen menu. Open the menu from the home screen. Navigate to System or About Device . Look for Factory Data Reset or Reset Options . This forces a low-level format of the security sector