Perform a factory reset, then look for "Touch Calibration" in the system menu.
If this is rejected due to a regional firm-ware variance, try the universal backup values: or 8888 . grundig gx3800 factory reset code verified
If 9876 does not work, try accessing the hidden service menu: Perform a factory reset, then look for "Touch
If the touchscreen is unresponsive or you cannot access the menu, most Grundig units feature a physical This is a deliberate design choice by Grundig
Security experts and independent technicians have noted that for most modern Grundig car radios, including the GX3800, any code required for resetting is typically and is not centrally or uniformly assigned for security reasons. This is a deliberate design choice by Grundig to prevent unauthorised access and theft.
If the device is functional but you want to clear all data for a new owner or to fix software bugs, use the internal menu system. Power on the head unit. Tap the (gear icon) on the main menu. Scroll down to the System or About section. Select Factory Reset or Restore Factory Settings .