MD782 (not i) with RCC05 Remote Head Kit Button Issues

[NCAmateurRadioGuy]

I recently bought a RCC05 kit for a MD782 I bought new in box about 8 months ago. Followed the install instructions etc and works pretty good overall, screen, audio, mic, etc. Some buttons have issues though. Specifically, P5, P2, and the top menu button with two dashed lines. Sometimes I get a double click or it operates the function of another button.

I've checked the ribbon cable connecting the data cable interface panel to the radio body. The radio head was preattached for the RCC05 kit and the instructions specifically say to leave it alone, so I haven't checked that ribbon cable.

Has anyone else had an issue like this? So far Hytera CS said to talk to dealer/seller. I haven't heard back from GigaParts and Atlantic radio said maybe update firmware, but other than that said they couldn't be more helpful since it's discontinued. CS mentioned the firmware was super old. Another thought was maybe some CPS settings?

Current Versions:
Firmware and DSP version: A8.05.07.004
Radio Data version: A8.05.06.004

EDIT:
Radio Model Number: MD782-00000000-000000-U1-H-L
/EDIT

Is there any real chance that firmware could be the issue? If so any guidance on updating would be great. I downloaded V9.00.07.105 batch upgrade from the HamDigitaal website (zip file name below), but I'm not positive that the NA version and think it might be the EM5 version. HamFiles has the NA version for V9.02.03.005, but I've never used HamFiles and don't have any points, so if anyone knows where to get a V9 firmware version, please give me a heads up.

Firmware file name:
DMR TerminalBatchUpgrade Subscribe TO V9.00.07.105 IM

Thanks for any help!

 

[NCAmateurRadioGuy]

Update:

Decided to ignore the instructions and swap the radio heads, issue remained the same, so the problem is in the remote head mount, cable adapter on the radio body, or the radio itself.