Android 8.1 update firmware - Android Head-Units

Hi,
I've had an Andriod Head Unit for my BMW F46 since March 2019. I have a few questions now.
Data of my head unit
Model: rk3399
Android Version: 8.1
Build number: rk3399-userdebug 8.1.0 OPM5.171019.019 eng.zxw.20181228.162012test-key
MCU: 615043bALS-NBT-HW7-190227 [B1280_170325]
Framewrok: 8.1.0 OPM5.171019.019 eng.zxw.20181228.162012
APP version: 2019031601_1280x480_970
I saw that there is the new Head Unit with Android 9.0 and ID 7 for my BMW. Can I update this to my head unit?
If yes, how?
My seller said that I would have to install a new mainboard for this update.
Thank you for your help.
Greetings mammoth

I have the same.
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model: px3 (1024x600 O)
android: 7.1.2
security patch Android: 5 May 2017
Kernel:
3.0.101+
[email protected] #899
Mon Mar 19 16:27:59 CST2018
compilation: px3-userdebug 7.1.2 NHG47L eng.hct.20180417.153934 test-keys
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MTCE_HLA_V2.80b_3
Mar 12 2018 13:34:01
CPU: ARM Coretex-A9 @1.6GHz (x4)
RAM 2048MB
ROM 16GB

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