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Failed remote command not allowed custom Rom (twrp)

Hi.
I've been trying to flash twrp my Huawai Mate 8 for a couple of weeks. I keep getting the error I mentioned in the title. The bootloader is unlooked, frp is looked. USB debugging is enabled. OEM is grey.
Android version 7.0, emui version 5.0.1. I've been using the official twrp and used adb files and fastboot from other sources as well as official files. The phone is NOT rooted.
Here is the full message:
fastboot flash recovery recovery.img
target reported max download size of 471859200 bytes
sending 'recovery' (22142 KB)...
OKAY [ 0.470s]
writing 'recovery'...
FAILED (remote: Command not allowed)
finished. total time: 0.477s
I would appreciate any help as this problem has bugged me for so long by now. Thanks!!

Can't flash boot.img and recovery.img by fastboot

OK so I tried to upadte to OREO with Hurupdater and something went wrong.
So I installed a rollback package - OK
Then tried to install MM and I entered in ERROR MODE
I get Func NO: 8 (hifi image)
Error no: 1 (security verify failed!)
Then I was able to enter in Fastboot recovery mode (after fully discharging the battery).
At this point I unlock the bootloader
fastboot OEM UNLOCK "UNLOCK CODE"
ok
I use Huawei update extractor to get boot, cust, recovery, system and user data from FRD-L04 MM Fw 4.1 found here
https://forum.xda-developers.com/honor-8/how-to/guide-comprehensive-method-to-unbrick-t3632998
I tried to flash cust and recovery but the processes failed (see below)
C:\adb>fastboot flash cust cust.img
target reported max download size of 471859200 bytes
sending 'cust' (252389 KB)...
OKAY [ 5.428s]
writing 'cust'...
FAILED (remote: partition error)
finished. total time: 5.441s
C:\adb>fastboot flash recovery recovery.img
target reported max download size of 471859200 bytes
sending 'recovery' (36976 KB)...
OKAY [ 0.796s]
writing 'recovery'...
FAILED (remote: partition length get error)
finished. total time: 0.825s
Any idea what I am doing wrong?
I heard that in Oreo partitions are different. That might explain the problem but on the other side I flashed a MM rollback already.
Please HELP!!!
Thx

Anyone?

https://forum.xda-developers.com/honor-8/how-to/guide-flashing-unapproved-firmwares-t3668306

problem with honor 6X when i want to flash twrp~

plaese help me ,this is what happpens ,it goes "FAILED (remote: partition length get error)"
BLN-AL10 ,with system is android 9.0,pie...omni version 9-20190203-treble-HOMEMADE,,,get from openkirin
PSwhat happens in adb)
C:\Users\admin\Downloads\工具箱adb>fastboot flash recovery twrp-3.2.3-0-berlin.img
target reported max download size of 471859200 bytes
sending 'recovery' (25068 KB)...
OKAY [ 0.693s]
writing 'recovery'...
FAILED (remote: partition length get error)
finished. total time: 0.699s

If you're on EMUI 8 (and you surely are, because you're running a treble OS) the correct command to flash on recovery partition is now "fastboot flash recovery_ramdisk nameoftwrp.img".
On previous EMUI versions the command you tried was correct, but things are changed now so recovery partition is now intended as "recovery_ramdisk".

Need fast help! Unbrick

I wiped everything in trwp when I was going to install Lineage, I did the misstake to restart the recovery and now Im stuck in the bootlaoder.
I need to install the stoc firmware via fastboot/bootlaoder but can't find any img file, only zip file of the Stock firmware.
Is is possible to install a zip file via fastboot?
Fastboot recognize the phone when typing the commando fastboot devices, so I see the serial nr.
If I try to install twrp img both on boot and flash recovery commando I get this:
PS C:\Android> fastboot boot twrp-3.2.1-0-enchilada.img
downloading 'boot.img'...
OKAY [ 0.577s]
booting...
FAILED (remote: Failed to load/authenticate boot image: Load Error)
finished. total time: 0.598s
PS C:\Android> fastboot flash recovery twrp-3.2.1-0-enchilada.img
target reported max download size of 536870912 bytes
sending 'recovery' (26748 KB)...
OKAY [ 0.574s]
writing 'recovery'...
FAILED (remote: (recovery_b) No such partition)
finished. total time: 0.579s
I have tried the MsmDownloadTool V4.0, but the deviced manager in windows doesn't find the Qualcom....

@Peterrrrr said:
I wiped everything in trwp when I was going to install Lineage, I did the misstake to restart the recovery and now Im stuck in the bootlaoder.
I need to install the stoc firmware via fastboot/bootlaoder but can't find any img file, only zip file of the Stock firmware.
Is is possible to install a zip file via fastboot?
Fastboot recognize the phone when typing the commando fastboot devices, so I see the serial nr.
If I try to install twrp img both on boot and flash recovery commando I get this:
PS C:\Android> fastboot boot twrp-3.2.1-0-enchilada.img
downloading 'boot.img'...
OKAY [ 0.577s]
booting...
FAILED (remote: Failed to load/authenticate boot image: Load Error)
finished. total time: 0.598s
PS C:\Android> fastboot flash recovery twrp-3.2.1-0-enchilada.img
target reported max download size of 536870912 bytes
sending 'recovery' (26748 KB)...
OKAY [ 0.574s]
writing 'recovery'...
FAILED (remote: (recovery_b) No such partition)
finished. total time: 0.579s
I have tried the MsmDownloadTool V4.0, but the deviced manager in windows doesn't find the Qualcom....
Click to expand...
Click to collapse
I have never tried msmtool, but it sounds like a driver issue. Maybe take a closer look at their instructions
You can try these fastboot flashable stock roms.

You have few options to solve your issue. Now you are in slot B. You can change switch partition to A with fastboot. Try use: fastboot --set-active=a. It will switch to partition A and then try to boot/flash recovery. Also you have try to use fastboot roms with flashall.bat. There are few availaible in forum.
If you would like to use MSM you have to connect phone in proper mode to PC. Power off and hold Vol+ then connect. Also try to install latest Qualcomm drivers.

Msm tool
Download and use msm tool

error installing twrp

trying to install twrp,the bootloader is already unlocked.
this is what happens:
fastboot flash recovery recovery.img
target reported max download size of 805263360 bytes
sending 'recovery' (34200 KB)...
OKAY [ 0.728s]
writing 'recovery'...
(bootloader) Invalid partition name recovery
FAILED (remote failure)
finished. total time: 0.841s
fastboot boot recovery twrp.img also give a error
what is the solution ?

neozbr said:
trying to install twrp,the bootloader is already unlocked.
this is what happens:
fastboot flash recovery recovery.img
target reported max download size of 805263360 bytes
sending 'recovery' (34200 KB)...
OKAY [ 0.728s]
writing 'recovery'...
(bootloader) Invalid partition name recovery
FAILED (remote failure)
finished. total time: 0.841s
fastboot boot recovery twrp.img also give a error
what is the solution ?
Click to expand...
Click to collapse
OK:
1. First you need to root the device. Follow this guide. You will use adb to patch the boot.img file of your current firmware.
2. After you have rooted, you can install the unofficial TWRP for Android 10 Moto G8 Plus from here. The zip file will install through magisk. Works fine; I tested it last night.