MMI Locked Flash with Apple Car Play

Original by MyDimeIsUp

If you’ve seen my previous thread, I was planning to update my MMI. Unfortunately, things did not go as planned. I used thenavman to obtain my files and began updating to K0942_3. However, during the process, I encountered an error: “Error communicating with device KBD_FC7:0.”

I can press the MMI knob down but cannot scroll to cancel the update. The only option I can select is “Retry,” which consistently results in the same error. I have tried using a different SD card and restarting the MMI, but neither solution has worked. The MMI will not turn off since the update is neither completed nor canceled, which may result in my battery draining completely.

I have contacted thenavman, but as it is nearing closing time in the UK, I do not expect a response until tomorrow. I am posting here to seek any suggestions or ideas from the community.

Update: I realized that my CarPlay was aftermarket, which I had become so accustomed to that I considered it a part of the car. I removed the MMI, disconnected the piggybacks and quadlock piggyback, and reinstalled the cables directly into the MMI. I retried the update, and it completed successfully. After reinstalling my CarPlay box, everything worked without issues.

This information might be relevant for those using RSNav, as my CarPlay is from AliExpress but utilizes similar piggyback connections. I am sharing this experience to assist anyone with aftermarket CarPlay/RSNav systems.