Zenfone MPM2 wont turn on after downgrading

[jsn2amzz89]

Hey guys!
I have the following problem. I have a Zenfone Max Pro M2 which I updated to Android 10. When I realized it had bugs which annoyed me I downgraded it back to Android 9. After successful installation I set the phone back to factory settings by wiping and and rebooted the phone. But it wont turn back on. My pc does makes a connection sound when I connect the phone to the pc via usb cable tho.
Any tips how to get it back on? Heres a screenshot of what ive installed. My phone isn't rooted or anything.

[Christine_ASUS]

Because I do not have your device by hand, I can not provide any inference by guessing. Please bring the device to the nearest service center for further device checking.

[ASUS_Bot]

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