Eunavi 2din problems after update - Android Head-Units

Hello everyone.
I have a problem that I am trying to solve for over a month, maybe someone here can help me.
I have Eunavi 2din android heading with Allwinner T8 cpu and 2 Gb ram. Android 8.1.
I had minor problems with software so seller sent me new firmware and MCU to be installed so I did it. Since then, my reversing camera stopped working (no video input), car do not show opened doors alert and generally Car info do not contain any information about my car (before all was working fine). Seller told me that nothing can be done here and that i should buy new radio from them.
Software before update:
Android 8.1
8-core allwinner rom 16GB - DDR 2GB 1024x600
OS Version BSP 2.0.4.3.4 - GDC-20181119
MCU Version : AN6B01 - MCU-V1.00-110401
After update:
Android 8.1
OS Version KC1D01H1-O01-3.0.4.3.5-IVT-20210318-701F
MCU Version STM8
Canbus settings are the same as before update. I got vw golf V.
Do you have any idea what can I try to fix this?

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