Well, I relocked bootloader rendering my phone unusable because dm-verity fail, then flashed .167 service firmware, updated to .194, unlocked the bootloader then upgraded to Android 10. It works now.
However to fix this issue you'll only need to:
1)Downgrade to Pie .194
2)Unlock the bootloader
3)Upgrade again to Android 10.
Unfortunately, afaik Asus doesn't provide any way to re-unlock the bootloader via fastboot which is real pain if you relock and your partitions remain altered in any way. So, be careful. Not-nice brick will happen otherwise.