to set up after factory reset, phone asks for but does not accept valid password
Model ASUS Zenfone 3 Max (ZC520TL)
Steps to replicate:
Boot to recovery. Select "Wipe & factory reset."
Allow phone to reboot and begin new set-up process.
Dialog opens stating phone was factory reset, and to continue please input old password.
Input either correct screen PIN from before factory reset, or valid password from Google account last associated with the phone.
Expected behavior: Set-up dialog accepts one of these, continues set-up process
Observed behavior: Set-up dialog reports invalid password, prompt repeats. After repeated attempts imposes a wait of 30 second between subsequent attempts.
Please advise how to either succesfully complete factory reset, OR unlock boot loader for this device. I am unable to find an Unlock Tool for this device on its support website.