Don't waste your time with the generic "0000" or "1234" codes you find on sketchy forums. The is a sophisticated piece of German engineering, and it requires a precise, firmware-aware approach.
Press and hold the button for 10 seconds while the ignition is in the "On" or "ACC" position. grundig gx3800 factory reset code better
: Look for a small pinhole on the front panel of the head unit. The Procedure : Use a thin, pointed object like a paperclip or a pen . Gently press and hold the button for 10 to 20 seconds . Don't waste your time with the generic "0000"