Black screen after booting Android 9 beta (ZC520KL)

andrewfehrandrewfehr Level 1
edited September 2020 in ZenFone Max Series

Please tell us some basic information before asking for help:

  1. Model Name: ZC520KL
  2. Firmware Version: WW-AOSP-16.0200.1907.18
  3. Rooted or not: No
  4. Frequency of Occurrence: Every boot up
  5. APP Name & APP Version (If your issue relates to the app): N/A


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.


  • edited May 2020

    Hi andrewfehr

    Thank you for asking. Please check if your previous firmware version is the latest Android 8 version (WW-15.2016.1907.519) before the Android 9 AOSP release.

    #ZC520KL Firmware Spot

    Please try to upgrade with SD card via PC download from ASUS offical site again.

    #SD card manual update guide

    1. First, try to install "WW-AOSP-16.0200.1907.18"

    2. If it doesn't work, try to install "ZC520KL_P_downgrade_to_O" then try to install "WW-AOSP-16.0200.1907.18"

  • I tried your suggestions but I still get the same problem.

  • Everytime I've tried to install the beta i've been installing it from recovery mode. When I wipe the data and then reboot, I get to the just a sec screen and after a couple seconds, that turns to black. I have attached a dmesg log if that is of any assistance to you.

  • 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?

  • 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.

This discussion has been closed.