Are You sure, that You have exactly the Firmware-File of Your Device, because there a few of it! And because of that, I'm not sure enough to try to root! In few cases it works, and in few not!? And have You try to flash with TWRP and not Stock-Recovery!?
I don't try to flash via TWRP, it may cause brick my devices (someone did and was brick).
First of all, I update through OTA update, but after reboot, it was an error. I tried several times but no success. Then I update via UPDATE.APP file (downloaded from the Firmware-Finder app, The downloaded firmware was exactly with update firmware in OTA update.), but get the same result. Still get the error.
How can i solve this error?