Follow these steps carefully to perform a factory reset on your Grundig GX3800:
If you have entered 99990 ten times, tried the capacitor drain, and the radio still freezes every 5 minutes, you may have a hardware failure, not a software one. grundig gx3800 factory reset code fixed
If your screen is black or frozen, use the physical reset button located on the front panel. Follow these steps carefully to perform a factory