Help to downgrade Android head unit - Android Head-Units

I've an Android 9 Snapdragon head unit for my Bmw f30.
I upgrade to Android 10 but has a lot of bugs and i want to downgrade but isn't possible to downgrade.
I can't get fastboot to work because USB and keyboard doesn't work.
I've my unit rooted with magisk.
It's possible to modify the necessary files (boot.img or wherever files are needed) and flash it in Android and then install update.zip (Android 9 rom) from recovery to downgrade?
Or modify the Android 9 rom to bypass the check that doesn't allow to downgrade?
Here are the Android 10 rom: https://mega.nz/#F!kbYFBS5C!gE-QFJoU...PxiJA!xXwSkQJb
And here is the Android 9 rom that i want to downgrade to: https://mega.nz/#F!kbYFBS5C!gE-QFJoU...PxiJA!xLJWECpK
Please, help me.
Thanks in advance.

help!

MOD ACTION:
Thread closed as duplicate of https://forum.xda-developers.com/an...its/donwgrade-android-version-magisk-t4062601

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