Strange UConnect issue on new-to-me 2019

[beemer]

Hi all, been creeping on here the last few months while we've been truck shopping. A few weeks back we finally found exactly what we were looking for, a 2019 2500 tradesman with the upgrades we were looking for and low miles.

The only thing I didn't like was the aftermarket android auto head unit. It worked fine, but it was too confusing, didn't have any of the vehicle settings for the lights and horn, and didn't use the factory camera.

I ordered a take-off 5" uconnect off ebay and put it in yesterday. Everything works perfectly except the volume control. The knob works, and the volume number changes on the screen, but the volume is stuck on fairly loud. I tried a soft reset with the power/tuning button but nothing happens. I disconnected the negative cable last night for about 3 hours and reconnected it without turning the truck on. I'll check it this morning but I'm assuming it won't work.

Anybody have any idea how to fix this?

I don't think it's an issue with the uconnect, the dealer we got it from said there was a volume problem and they'd added the android HU because of it. This truck has the ANC if that matters. TIA

 

[beemer]

Also, the fade/balance don't seem to be working. I can't hear much coming from the fronts, and don't hear the parking sensors anymore. Everything worked great with the android HU.