Black screen after update in huawei mate 9 pro

[huaweimate9pro]

Hey guys
Recently I updated my phone(huawei mate 9 pro, Lon-L29) to the latest android version 9 and after the update the phone rebooted twice and it didnt skip that, it stuck on the eRecovery screen with 4 options:
scan wifi and upgrade
wipe data/factory reset
reboot
shutdown

I tried the first option several times with no success, I've got "Getting package info failed"
I tried Vol+power to wipe cache and reboot with no results
I tried to update it again by connecting it to my pc and pressing on vol+ and vol- and power and it showed me the updating screen and it stuck on 5% for 3 min and rebooted again to the 4 options.

I tried dload method with external usb because there is no sd card in mate 9 pro, nothiiiing.

I tried Minimal ADB and Fastboot, Huawei FRP Tool, to unlock bootloader/ frp, nothing!
I tried DC_Phoenix_v69 and HCU client, HCU showed " device not found" , "its not support chipset" , I tried to update it by Phoenix and it showed that huawei didnt accept all the files in update.app, ex:PACKAGE_TYPE
but when I put another update.app it accepted PACKAGE_TYPE in it but not the other parts and in each one it gave me that my phone security is not supported by Phoenix!
In one of the files(update.app) that I tried the phone screen turned off and didnt come back again, I tried to open HiSuite to recover the phone and it showed that it stuck on fastboot, I tried to exit from fastboot by Minimal ADB and Fastboot and Huawei FRP Tool with no results!
My phone is dead now and I didnt backup my files, so sad
Any help?

[Valdemaras]

Replacing main board on it would help if loader + oeminfo could not put it into fastboot by following dc-phoenix guide.

[huaweimate9pro]

Thank you, I'll send it to a technical support center.