Phone not updating

Phone (zenfone Max pro M2) not detecting any updates. Tried manual ways too.
System update failed (3) unknown error system restored to previous configuration
Manual way :the zipped firmware file is in phone memory main page itself (moved from " downloads " folder. But when tires to reboot ,it reboots as usual (not detecting any updates).
Then tried through BIOS . But says installation aborted
Still in Android 9. (Details in screenshot)
Want to move to latest version provided by Asus ( that version in screenshot attached)
Done one update in 5th June 2019 (which was successful) , after that tried to update but atlast (after booting) it says update failed system restored to previous configuration . Please help me and thank you for reading this.
email [email protected]
Comments
You should not unzip the update file.
Sorry ,it was zipped file itself ( not unzipped)
Any other reasons?
Thanks for going through this issue 😊
The downloaded file might be corrupted. Did you tried to re-download and install?
If, not do it again without any interruption between download.
Done that again (no interruptions while download from Asus website). Done in automatic & through BIOS (recovery mode) way .
Still same problem
Any other way ?
You are currently on build no .65, right ?
Try to install the next version available instead of downloading the latest .97 build.
Tried that now, download a previous update version , still same problem
Should I try any particular update version. ?
If your current version is the second one in this pic, install the first version shown in the pic
Tried that too. Didn't work.
So it's not about versions either
Thanks for suggestions :) . Any other way?
This message poped up at random times
Try to factory reset the device and search for auto update if not try to update manually.
(Take backup of Internal Storage to avoid data loss before resetting)
If above didn't work, visit service centre they will reflash the ROM.
Looks like it's the only way. Thanks for your response 😊