Black screen after update in huawei mate 9 pro - Android Q&A, Help & Troubleshooting

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, exACKAGE_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!
I tried to exit from fastboot by Minimal ADB and Fastboot and Huawei FRP Tool with no results! My phone is dead(black screen) now and I didnt backup my files,
I tried chimera but it showed an error "failed to read the file" and the phone is in fastboot!
My phone is dead now and I didnt backup my files, so sad
Any help?

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crassus96 said:
Hello everyone,
So today I tried installing lineageos and after some stupid moves on my part I´m currently stuck at a screen saying Reset failed. with a red exclamation point and the only option is reboot system now( which I cant select). I can´t access fastboot nor twrp, the phone has FRP and Bootloader Unlocked at least the last time I was on the fastboot screen. My model is RNE-L21 europe, do you have any ideas? I have seen somewhere, cant find the post now but the guy waited the phone to reach 0% and then he was able to put it in fastboot. Any help is appreciated.
Click to expand...
Click to collapse
What were the "stupid moves"?
I can´t tell precisely but I tried using HWOTA which ended in an error I thought the error came from the oemfile being damaged, because on the HOWTA the model only appeared RNE-L21 so I installed oemfile tried the HOWTA again with no success reinstalled the TWRP version which I used to do my backup, restored and here I am.
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Solved the issue, wait for the battery to die. After that connected to pc booted in fastboot and used HuRupdater.

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