Android 9 update error on ZC520KL

APP Name:
Frequency of Occurrence: first time
Rooted: Yes
Firmware/APP Version: Android 8.1.0
ZF Model: ZC520KL


I tried to update my phone to the android 9 beta firmware zip file i downloaded from ASUS and then i put it to the internal storage but when i tried to install it, it keeps showing "error" on the boot and after it restarts, it says " SYSTEM UPDATE FAILED (3)" "UNKNOWN ERROR"

can someone please help me to this problem or is there a solution to this.

thank you very much for those who know can help.......


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