Black screen after booting Android 9 beta (ZC520KL)

[andrewfehr]

Please tell us some basic information before asking for help:
Model Name: ZC520KL
Firmware Version: WW-AOSP-16.0200.1907.18
Rooted or not: No
Frequency of Occurrence: Every boot up
APP Name & APP Version (If your issue relates to the app): N/A
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I have been trying to install the android 9 beta on my zenfone but I keep running into the same issue. Every time I try to boot up, I'm able to make it up to the Zenfone boot animation but then the screen just turns black and android does not start up. Occasionally, the screen shows the just a sec screen and the loading icon but that quickly turns to black. I am willing to provide more information but I do not know what would be helpful so any assistance and suggestions would be greatly appreciated.

[Christine_ASUS]

Hi andrewfehr
Sorry to confirm with you again to avoid any misunderstanding: 
1. You could operate update via micro sd card, but at the last step "re-boot", the device would turn black?
2. You could not upgrade to Android 9 beta or downgrade to Android 8. Is that correct?

[andrewfehr]

I am able to install the android 9 beta via micro sd and recovery mode, but once it boots up, the screen goes black before I can use the android setup. I am unable to install the android 9 beta but I am able to install android 8 without a problem.