Try to go to ABOUT in settings and do a MCU upgrade. If that dont work go to GENERAL - EXTRA SETTINGS (code 123456 or 8888) - MODEL CHOOSE.I tried accessing the SettingWheel app to reprogram the "call answer button". Here is what I did:
1. Press Start
2. Select "Answer" on screen
3. Press the "Call Answer" button on steering wheel
That sent me straight to the bluetooth screen. Seems like I can't even reprogram the button
Btw, the TS10 unit I bought came with a CANBUS box and as I have read in another thread, the steering wheel buttons cannot be reprogrammed if there is a CANBUS box present. Maybe I'm wrong, perhaps anyone has any idea about this and is anyone with the same firmware version experiencing the same thing?
EDIT: I updated the firmware using the online update section in the head unit. If I could downgrade this current version to something older, not sure if it would help.
Take a picture of the CANBUS settings! (so you remember it)
Then press the exact same settings again and press OK and it should update (need to be online).