help please/ recovery flash error - Huawei P9 Questions & Answers

Greetings
I'm trying to flashe recovery TWRP and it gives me an error
"FAILED (remote: image verification error)"
What should I do?
The botlauder is open

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I am trying to restore my S7 using the nvflash method as posted by illdill and I am getting the following error after the boot loader is downloaded successfully:
failed executing command 31 NvError 0x120002
command failure: writedeviceraw failed (bad data)
Any ideas?
Thanks
I believe this is the read only error that people have been talking about before. I was wondering if I formatted all the partitions if this would help to re-write the .img files. Anyone out there with a clue about NVFlash?

Failed to flash TWRP.

Hi,
I tried to flash TWRP to my phone using the command: "fastboot flash recovery twrp-3.0.2-0-titan.img"
This failed and gave me a message saying "mismatched partition size (recovery)"
What can I do?

Error twrp

Please help, my devices after instal rom globe can not enter to recovery mode . .
And try reinstalling it TWRP not responding/unavailable
And try reinstalling TWRP recovery to devices in command ,
Failed ( remote : Failed to load/authenticate boot image : Load Error)

Question 'Your device is corrupt' message after failed Magisk A/B update. Flashed factory image, phone is now booting but message persists

I didn't realize that Pixels didn't work with Magisk's A/B update method, so I tried it, and afterwards I received the 'Your device is corrupt' on startup and the phone wouldn't boot.
I ended up flashing the December factory image (sans -w flag), and the phone now boots, but I still am receiving the 'Your device is corrupt' message on startup.
I did flash the patched init_boot, but the message existed before then.
Would anyone know of any steps I can take to get rid of this message? Preferably without data loss?
Thanks in advanced for any help.
Hmm. Try sideloading the OTA, see if that fixes it. Somehow, dm-verity got stuck in EIO mode. More details here
Edit: Did a little more research. In a ADB terminal (either recovery or system) you can use adb reboot "dm-verity enforcing"
Thanks for the reply.
Trying to sideload the OTA with adb sideload image.zip gives me the following error on my phone:
ERROR: recovery: footer is wrong
ERROR: recovery: Signature verification failed
ERROR: recovery: error: 21
I have verified the .zip hash matches the hash on the factory images site.
_____
If I try to run adb reboot "dm-verity enforcing" it gives me a "too many arguments" error in my terminal.
I did find this command, which seems the newer way of doing this:
fastboot flash vbmeta –disable-verity –disable-verification vbmeta.img
... but running that with the vbmeta.img from the OTA zip gives me this weird error:
fastboot: error: cannot load 'ûdisable-verity': No such file or directory (û character included)

Question NO system partition?

I am feeling pretty lost.
I have flashed to stock boot.img and am in fastbootd, now trying to flash system.img
When I type "fastboot erase system" I get the error FAILED (remote: 'Partition doesn't exist')
When I type "fastboot flash system system.img" I get the error FAILED (remote: 'No such file or directory')
My phone only boots into fastboot or fastbootd at this point. What can I do?

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