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W4400NEX - Not saving firmware update or Bluetooth changes

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I've got an AVH-W4400NEX unit in my 2015 Honda CRV. I'm having a problem where Bluetooth connections and firmware updates aren't saving after the vehicle is turned off and restarted.

First noticed the issue with Bluetooth not saving my new phone or clearing existing connections. I've tried parking brake fixes based on various forum posts and YouTube videos (e.g. grounding + "Set On" menu, MicroBypass etc). Later I discovered my 1.01 > 1.02 firmware upgrade won't stick either!

Internally I'm using the iDatalink Maestro H02 wiring harness and Maestro RR interface for steering wheel control retention etc.

Could this indicate SD card issue, wiring problem, blown fuse, any other ideas??

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  • 2 weeks later...

Update! My problems with saving Bluetooth connection changes and firmware updates were fixed by replacing the internal SD card.

First, I created a new SD card using the image and general instructions found here:

Next, I took apart my unit then swapped the SD card by following this video:


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