Zenfone 4 max, ZC520KL model ASUS_X00HD mailing to update
I am trying to update my ASUS ZenFone 4 max ZC520KL model X00HD.
I downloaded the zip file from the ASUS firmware update page and placed it in my phone root directory.
After restarting the phone the update file is detected and I can start the procedure.
However either the installation stops and reports an unknown error or the phone reboots in recovery mode without applying the update.
I am on android 7.1.1, WW SKU.
What should I do?