Wait, there is a PIN? Yes, but not the kind you type. You need a paperclip or a pin.
Step-by-step:
Result: This cuts the power momentarily to the processor. You have just performed a "soft" factory reset. All temporary memory (including Bluetooth pairings) is cleared.
Before resetting, check which firmware you have. Turn the radio off, then press and hold "Memory" + "Power" . The display will show "FW 1.0" or "FW 2.2." grundig gx3800 factory reset code better
Doing it better means matching the code to your firmware.
Step 1: Power Down Completely Turn the rotary volume knob to "Off." Disconnect any USB devices from the output port.
Step 2: Kill the Solar & Dynamo Cover the solar panel completely (put it face down on a dark cloth). Do not crank the dynamo. Any incoming power will prevent the reset. Wait, there is a PIN
Step 3: The Battery Bridge (Critical) Remove the back cover. Unplug the internal rechargeable battery pack from the circuit board. Wait 30 seconds. This is the step most people skip.
Step 4: The Button Press While the battery is unplugged, press and hold the Power button and the Light button simultaneously for 60 seconds. This drains every capacitor on the main board.
Step 5: The Reset Pinhole Locate the small pinhole labeled "Reset" near the battery compartment. Insert the paperclip and press the internal switch for 10 seconds. Result: This cuts the power momentarily to the processor
Step 6: Reassemble Plug the battery back in. Close the cover. Turn the device on.
Result: Your GX3800 is now in the exact state it was when it left the factory in Shenzhen. All presets are gone. The clock is reset. The charge controller is re-calibrated. This is the true factory reset.