Many online searches for a "Grundig GX3800 factory reset code fixed" are actually mixing up these two scenarios. Let's address each separately.

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If you currently own a Grundig GX3800, locate and safeguard your security code before you need it. Write it down in multiple places—your phone's notes app, inside your car's owner's manual, and perhaps even taped to the back of the radio chassis. A few minutes of prevention now can save you hours of frustration later.

Are you currently of the unit, or are you trying to fix a specific software glitch ? GX-3800 - User Manual

One user, “K4SWL” (a noted shortwave listener), wrote: “My GX3800 was stuck on a single frequency with no response to any button. I tried holding INFO and typing 99990, and within 3 seconds the screen flashed. It booted up like new. This is the only method that works.”