To access the "Extra" hidden OS:

The software update download file for the Becker Traffic Assist 7977 is typically a zip file, which contains the update software and instructions. The file size may vary depending on the update version, but you can expect it to be around 100-200 MB.

The "Extra" package may have loaded a generic touch driver. Fix: Download TouchCalibrator_7977.exe . Copy to SD card. Run it from the File Explorer. Follow the 5-point calibration.

To download the Becker Traffic Assist 7977 software update, follow these steps: