Database Users

[ROOT][MARSHMALLOW][HONOR 4C] Root, Recovery & Bootloader Unlock by HassanMirza01

DESCRIPTION:
Today i found the New Root & Installing Custom Recovery(TWRP) in MARSHMALLOW ROM surely...
I will Provide correct info and help......All This you are gonna do is At your Own Risk... Damage to your device of any type is at your Own Responsibility,,, Don't point finger at me or I will Just Laugh at you...
PREREQUISTES:
First of all, You should Unlock Bootloader so that on every reboot, Your Root shouldn't damage. You can unlock bootloader by simple procedure...and also enable the USB Debugging from Developers options in settings...
PROCEDURE:
FOR UNLOCKING BOOTLOADER, FOLLOW THIS
Download the Attached PC Software Named "Huawei Product ID Generator" then Extract this zip file...
Now open it, fill all Info in it and it will Generate a Product ID for your Phone....
Now go to this site Unlocking Code website
Login to this site using your Huawei id which you made in themes store or in huawei cloud!!
Use the Serial Number Written on BACK OF YOUR PHONE..!!
Fill like, smartphone>Product Model should be "HUAWEI Y300-0000"
then fill all fields and captcha also.. Click Submit and get the UNLOCKING CODE....
you can unlock bootloader wid that code then and root permanently....
After receiving the unlock code, write down the code;
Now go in your 4C's Settings>About Phone.
Then tap on Build number 10 times,,, you will get the Developers options in Last of Settings app. Open Developers option and Turn On the USB DEBUGGING.
Now connect your device to PC in MTP/FILES mode and then install the ADB drivers for it....
To install adb drivers correctly, use the Software Adb Driver Installer from here
LINK FOR ADB DRIVER INSTALLER
Full ADB folder is also attached Below.... put this folder in drive C.
Now Direct the cursor on the folder ADB, hold Shift and the right mouse button and choose "Open Command Window";
connect your phone to the PC in the "media device";
at the command prompt prescribe ADB Devices ;
then we write ADB reboot bootloader (the device will reboot mode fastboot);
then typed fastboot oem unlock **************** (where the asterisks replace unlock code);
BOOTLOADER UNLOCKED NOW!!
Now You are Ready to install TWRP recovery in Marshmallow first.... Download the Root and TWRP recovery File from here...
This File Also contain Stock Recovery of Marshmallow Rom
4C Root+TWRP by [email protected]
After this, unzip it and better come again in Fastboot Mode like above as explained, this time, move the recovery file to the adb folder which you want to install.
After that, type fastboot devices to see if your device is correctly attached to PC or Laptop. if yes then type this command in cmd to install the Custom Recovery(TWRP) in your phone.
fastboot flash recovery twrp.img
Then
fastboot reboot
This will reboot your phone and TWRP installed.
Gonna Done Root now... READ CAREFULLY... ROOTING MARSHMALLOW IS NOT EASY...
Download This Zip File and then Go in TWRP recovery and swipe for allow modifications...... and then flash that zip file named 1.zip...
After its done,, restart your phone and if it promp to install su, ignore it....
Open supersu app installed in your phone and let it update its binaries...when done, reboot to recovery again and this time flash This File.
Then reboot your phone and then supersu will be stable,,,
Now you have Successfully Rooted Marshmallow
Hit Thanks and Support me if you Like and get help from this thread...Thank you...
This is Based on Stock Huawei Kernel, Not compiled by Me...
Contributors:
@HassanMirza01
Mohamed A. Abd Ellatif
Version Information:
Status: Stable
Stable Release Date: 2015-09-28
Created on: 2016-02-19
Last Updated on: 2016-04-09

Reserved

Is this is TWRP for Marshmallow? Because the recovery files.you have uploaded are dated 25th September 2015?

@mfbcool yes...this is for Marshmallow... But dont swipe allow modifications!!
Member gettin error after swiping...just do read only...

I root my device by this method yesterday
but today root not work in titanum backup
I check it by root checker and everything is ok

Even though this method works, I would not recommend moving SuperSU to system partition. I didn't moved it and still SU permissions are working fine. I say so because Chainfire in his new SuperSU adopted a 'Systemless Root' method that roots without modifying the system partition so that apps like Android Pay work properly. He achieved this by patching the Boot image and so root is installed in boot image and is enabled at every boot (that's why you may experience some boot loops after rooting). This makes taking OTA updates and unrooting the device easier as you can unroot by flashing the Stock Boot.img instead of flashing the whole system partition.
I believe moving SuperSU to system partition destroys the main purpose and idea Chainfire had while making SuperSU compatible with Marshmallow. We all know EMUI won't update on Rooted devices. So it would be a pain to reflash whole Stock System Partition before taking OTA.

Hi thanks, I'm root my mobile I'm in android 6.0 now how to get back to kikkat a stock rom from twrp

@G E N E R A L open supersu app and tick the mount name separation and restart phone... Titanium, kingroot all will recognize root
Hit thanks if it helps....
@TMDMOOSA if you wanna go back to KK, Flash stock recovery first!!
Then flash the back pkg B320, then B070
If you gets error, flash middle pkg of chc rom and then flash directly KK Rom usin stock recovery!!

hi
i have a problem
by flashing file 1.zip phone reboot twice and screen go black and nothing happens after
by flashing the ROM problem fix but i cant root my phone
i try this three times!!
what can i do?
thnx

@inshaalmirza
hello, I by mistake flash the root.zip of lollipop to my phone running marshmallow. Now my phone is stuck on bootscreen. what should I do now. adb is not working

onlyankush_s said:
@inshaalmirza
hello, I by mistake flash the root.zip of lollipop to my phone running marshmallow. Now my phone is stuck on bootscreen. what should I do now. adb is not working
Click to expand...
Click to collapse
this happened for me by flashing right zip file!!!
no solution??
i wipe all the data (even system data) by custom recovery and turn off the phone and hold power volume down and up together
by doing this if you have ROM file in your sd , new ROM will be instal on your device
just please tell me how i can root my phone??

@inshaalmirza @ mfbcool please reply what to do
onlyankush_s said:
@inshaalmirza
hello, I by mistake flash the root.zip of lollipop to my phone running marshmallow. Now my phone is stuck on bootscreen. what should I do now. adb is not working
Click to expand...
Click to collapse

onlyankush_s said:
@ mfbcool please reply what to do
Click to expand...
Click to collapse
Flash the complete Marshmallow ROM through Stock Recovery.

matinone said:
hi
i have a problem
by flashing file 1.zip phone reboot twice and screen go black and nothing happens after
by flashing the ROM problem fix but i cant root my phone
i try this three times!!
what can i do?
thnx
Click to expand...
Click to collapse
no one??
please

@onlyankush_s go in fastboot and then flash the system.img again.... Or flash stock M wid stock recovery...

@matinone there is written that flash supersu again after flashing 1.zip
Flash supersu zip too and tell... Or flash srock rom again by same method i told in most previous posr.... I am sick right now thats why replying late!!

inshaalmirza said:
@matinone there is written that flash supersu again after flashing 1.zip
Flash supersu zip too and tell... Or flash srock rom again by same method i told in most previous posr.... I am sick right now thats why replying late!!
Click to expand...
Click to collapse
thanks a lot!!!
it worked
by the same steps.it look like i got lucky this time
hope you get better soon

hi
plz help
i flash stock recovery and my phone go to rescue mode
help

I have successfully built TWRP 3.0.0-0 for our device which fixes the weird swipe to allow modifications bug and is fully compatible with Android 6.0 Marshmallow.
See here: http://forum.xda-developers.com/android/development/recovery-twrp-3-0-0-0-huawei-honor-4c-t3349495
Also, to re-flash Stock ROM, you don't need to flash Stock Recovery. Huawei phones have 2 inbuilt recoveries. The second recovery (which is the Stock) can be accessed by 3 buttons method (Power + Volume Up + Volume Down).

@mfbcool i saw that thread early... Great work man... I know huawei have 2 inbuilt recoveries but 2nd one is erecovery and thats of no use at all... I tried it too many times!! If twrp 3.0 can flash update.app files,,, it gonna rocks , wish u best of luck man!! You did it

Guide to revert oneplus 3t to stock completely and install OTA update

Hello Friends,
I have seen several Youtube videos and read the thread of xda senior member the rooter to unroot and revert the oneplus 3t to stock. The senior member guided very beautifully to have the stock ROM with or without the bootloader unlocked and fix DM-verity issue.
The following guide is not my invention, I have taken the sources from internet and xda site. The difference is that I used TWRP to flash official oxygenOS zip file of 4.1.6 and I am surprised that this file also flash stock recovery, therefore I did not flash stock recovery and proceeded further for full wipe and lock bootloader. In the middle of thread, I also alerted and said that if stock recovery is not flashed after installing zip of 4.1.6, then it is mandatory to flash stock recovery from fastboot before locking bootloader, otherwise your devices will be bricked.
1) Flash Oxygen OS 4.1.6 through latest TWRP 3.1.1.2 and remember to wipe system, cache, data and delvic cache excluding internal storage before flashing. Do not wipe completely otherwise you will have TWRP installed again and you will have to flash stock recovery through fastboot method.
Link for official TWRP for oneplus 3t: https://dl.twrp.me/oneplus3t/twrp-3.1.1-2-oneplus3t.img.html
Link for official stock recovery for oneplus 3t: http://downloads.oneplus.net/oneplus-3t/oneplus_3t_oxygenos_4.1.7/ , here go down the page and click on "Download Oxygen Recovey (Optional)"
After booting successfully, go to setting and tap the build number 7 times to enable advanced reboot and usb debugging and connect your mobile with your PC and make sure that you have adb drivers installed on your PC.
Now, extract the folder of fastboot and press the right click of mouse while pressing shift button. Basically you have to open command prompts. Now type: adb reboot recovery and hit enter.
2) Your phone should boot into oxygen stock recovery and if it does not boot to stock recovery then flash stock recovery from fastboot.
2) Now your oneplus 3t is having Oxygen OS 4.1.6 with stock recovery but having DM verity issue. Now, full wipe ( select erase everything) in stock recovery and reboot. This wiping through stock recovery may be extra step (locking the bootloader will erase your data completely) but I did this to avoid any problem.
3) Now, sideloaded the same file i.e. oxygen OS 4.1.6 or OOS 4.1.7 through the following command:
adb sideload OTA.zip
where OTA is zip file downloaded from oneplus site for oneplus 3t and renamed it as OTA
(For this, you will have to go to stock recovery and select the option of "install from ADB" then a pop up screen will show you that you are in sideload mode. But remember that sideloading the OS is a slow process; so keep patience and do not remove cable in the middle of installation otherwise your device will be bricked.)
4) Now, lock the bootloader from the command in fastboot mode:
fastboot oem lock
after entering the command in fastboot mode, a confirmation will be asked to lock the bootloader for Yes or No, confirm from the volume keys and let boot the phone automatically and wait to finish.
5) If you sideloaded the OOS 4.1.6 in step 3 then you will see the update notification of OOS 4.1.7 which is about 450MB, download it ,install it and reboot.
6) Enjoy............the stock
Thanks to guides on youtubes and xda site.
Please note that if you follow these steps, you will not have any issues because I have done again and again without any issues but I do not take any responsibility of bricked devices if you perform wrong method or skip any thing.
Please hit the like if find this useful, it is absolutely freeeeee.............

What if I currently have no OS installed? Does that matter?

sandeep_kumar said:
Hello Friends,
I have seen several Youtube videos and read the thread of xda senior member the rooter to unroot and revert the oneplus 3t to stock. The senior member guided very beautifully to have the stock ROM with or without the bootloader unlocked and fix DM-verity issue.
The following guide is not my invention, I have taken the sources from internet and xda site. The difference is that I used TWRP to flash official oxygenOS zip file of 4.1.6 and I am surprised that this file also flash stock recovery, therefore I did not flash stock recovery and proceeded further for full wipe and lock bootloader. In the middle of thread, I also alerted and said that if stock recovery is not flashed after installing zip of 4.1.6, then it is mandatory to flash stock recovery from fastboot before locking bootloader, otherwise your devices will be bricked.
1) Flash Oxygen OS 4.1.6 through latest TWRP 3.1.1.2 and remember to wipe system, cache, data and delvic cache excluding internal storage before flashing. Do not wipe completely otherwise you will have TWRP installed again and you will have to flash stock recovery through fastboot method.
Link for official TWRP for oneplus 3t: https://dl.twrp.me/oneplus3t/twrp-3.1.1-2-oneplus3t.img.html
Link for official stock recovery for oneplus 3t: http://downloads.oneplus.net/oneplus-3t/oneplus_3t_oxygenos_4.1.7/ , here go down the page and click on "Download Oxygen Recovey (Optional)"
After booting successfully, go to setting and tap the build number 7 times to enable advanced reboot and usb debugging and connect your mobile with your PC and make sure that you have adb drivers installed on your PC.
Now, extract the folder of fastboot and press the right click of mouse while pressing shift button. Basically you have to open command prompts. Now type: adb reboot recovery and hit enter.
2) Your phone should boot into oxygen stock recovery and if it does not boot to stock recovery then flash stock recovery from fastboot.
2) Now your oneplus 3t is having Oxygen OS 4.1.6 with stock recovery but having DM verity issue. Now, full wipe ( select erase everything) in stock recovery and reboot. This wiping through stock recovery may be extra step (locking the bootloader will erase your data completely) but I did this to avoid any problem.
3) Now, sideloaded the same file i.e. oxygen OS 4.1.6 or OOS 4.1.7 through the following command:
adb sideload OTA.zip
where OTA is zip file downloaded from oneplus site for oneplus 3t and renamed it as OTA
(For this, you will have to go to stock recovery and select the option of "install from ADB" then a pop up screen will show you that you are in sideload mode. But remember that sideloading the OS is a slow process; so keep patience and do not remove cable in the middle of installation otherwise your device will be bricked.)
4) Now, lock the bootloader from the command in fastboot mode:
fastboot oem lock
after entering the command in fastboot mode, a confirmation will be asked to lock the bootloader for Yes or No, confirm from the volume keys and let boot the phone automatically and wait to finish.
5) If you sideloaded the OOS 4.1.6 in step 3 then you will see the update notification of OOS 4.1.7 which is about 450MB, download it ,install it and reboot.
6) Enjoy............the stock
Thanks to guides on youtubes and xda site.
Please note that if you follow these steps, you will not have any issues because I have done again and again without any issues but I do not take any responsibility of bricked devices if you perform wrong method or skip any thing.
Please hit the like if find this useful, it is absolutely freeeeee.............
Click to expand...
Click to collapse
How can i find one plus 3t recovery I cant find both twrp and one plus official recovery.

Hard/soft brick

I think I messed up my PH-1 something royally.
All I was trying to do is unlock my bootloader and load Magisk.
To preface this, my PH-1 seemed to act a little wonky from the get-go. I bought it 3rd person from a guy on craigslist so anything warranty involved I think I'm out of luck.
The phone would take a while to power on, it took something like 10secs on the power button just to turn it on. And if I set it to reboot , it boots into the bootloader. Also, I was never able to access the recovery (even using power + up). It always felt like I had to hold the buttons for way to long to get to its destination; e.g. up and power to get into fastboot.
Ok where I'm at now. In can occasionally get into fastboot mostly after it bootlooping a few times. It won't get past the Essential logo if I try to boot it up.
PS I was able to unlock the bootloader.
Steps I took to remedy this:
> erase all user data in fastboot
> hold power + u + d to hard power off
> follow this guide https://forum.xda-developers.com/essential-phone/how-to/guide-rooting-essential-ph-1-magisk-t3701976
> attempt to install stock system image via flash-all
>a ton other
Here are the results of that.
https://imgur.com/a/iVwwS
Help me guys please. :crying:
A little progress, I was unable to unlock_critical but its still hanging here
https://imgur.com/a/IdZum

jAm-0 said:
I think I messed up my PH-1 something royally.
All I was trying to do is unlock my bootloader and load Magisk.
To preface this, my PH-1 seemed to act a little wonky from the get-go. I bought it 3rd person from a guy on craigslist so anything warranty involved I think I'm out of luck.
The phone would take a while to power on, it took something like 10secs on the power button just to turn it on. And if I set it to reboot , it boots into the bootloader. Also, I was never able to access the recovery (even using power + up). It always felt like I had to hold the buttons for way to long to get to its destination; e.g. up and power to get into fastboot.
Ok where I'm at now. In can occasionally get into fastboot mostly after it bootlooping a few times. It won't get past the Essential logo if I try to boot it up.
PS I was able to unlock the bootloader.
Steps I took to remedy this:
> erase all user data in fastboot
> hold power + u + d to hard power off
> follow this guide https://forum.xda-developers.com/essential-phone/how-to/guide-rooting-essential-ph-1-magisk-t3701976
> attempt to install stock system image via flash-all
>a ton other
Here are the results of that.
https://imgur.com/a/iVwwS
Help me guys please. :crying:
Click to expand...
Click to collapse
read through this and follow the steps should be good to go.
https://forum.xda-developers.com/essential-phone/development/stock-7-1-1-nmj20d-t3701681
This is also very helpful
https://mata.readthedocs.io/en/latest/

That's the exact process I was going through, and it finally booted up.
The issue I was having was a bad usb connection which wouldn't allow me to unlock_critical.
SOLVED. Still no Magisk, we'll worry about that another time. 5hrs of troubleshooting is enough for one night.

https://imgur.com/a/ZiBzp
SO close to getting Magisk to install, any reason the refuses to flash the boot partition? I used the stock boot.img and had Magisk patch it before I flashed

SO close to getting Magisk to install, any reason the refuses to flash the boot partition? I used the stock boot.img and had Magisk patch it before I flashed

jAm-0 said:
SO close to getting Magisk to install, any reason the refuses to flash the boot partition? I used the stock boot.img and had Magisk patch it before I flashed
Click to expand...
Click to collapse
You have to flash magisk in twrp recovery NOT bootloader mode.
It's right in the OP from the rooting guide you followed:
Do not set up a password if you are on 8.1 twrp doesn't work.
You need to read through that rooting guide and make sure you know what you're doing before you try.
This phone is easy to hard brick and there is no solution to recover from that.
OREO 8.0/8.1
REQUIREMENTS:
An unlocked bootloader.
A working ADB/Fastboot environment on your computer. Knowledge on how ADB and Fastboot works is also preferred.
The stock boot image for whatever build you're running/trying to root.
The latest TWRP build for our device.
If on 8.1, remove your pin/pattern/passcode until the root process is done.
1. Download both the stock boot image for whatever build you're running and the Magisk or SuperSU zip. Transfer both files to your device's internal storage.
2. Reboot your phone into the bootloader, then open up your command prompt or terminal and flash the latest TWRP build for the device using:
Code:
fastboot flash boot twrp.img
3. Once TWRP has finished flashing, reboot into your recovery. When prompted, enter your pattern/passcode/password to decrypt your data in order to gain access to your internal storage.
4. Once you're in TWRP, install the stock boot image and then the Magisk/SuperSU zip.
5. Whenever Magisk/SuperSU finishes installing, simply reboot your device! You should now be rooted.
*NOTE: TWRP will NOT remain installed on your device.

wolfu11 said:
You have to flash magisk in twrp recovery NOT bootloader mode.
It's right in the OP from the rooting guide you followed:
Do not set up a password if you are on 8.1 twrp doesn't work.
You need to read through that rooting guide and make sure you know what you're doing before you try.
This phone is easy to hard brick and there is no solution to recover from that.
OREO 8.0/8.1
REQUIREMENTS:
An unlocked bootloader.
A working ADB/Fastboot environment on your computer. Knowledge on how ADB and Fastboot works is also preferred.
The stock boot image for whatever build you're running/trying to root.
The latest TWRP build for our device.
If on 8.1, remove your pin/pattern/passcode until the root process is done.
1. Download both the stock boot image for whatever build you're running and the Magisk or SuperSU zip. Transfer both files to your device's internal storage.
2. Reboot your phone into the bootloader, then open up your command prompt or terminal and flash the latest TWRP build for the device using:
Code:
fastboot flash boot twrp.img
3. Once TWRP has finished flashing, reboot into your recovery. When prompted, enter your pattern/passcode/password to decrypt your data in order to gain access to your internal storage.
4. Once you're in TWRP, install the stock boot image and then the Magisk/SuperSU zip.
5. Whenever Magisk/SuperSU finishes installing, simply reboot your device! You should now be rooted.
*NOTE: TWRP will NOT remain installed on your device.
Click to expand...
Click to collapse
I realize all that, the issue is I cannot access any sort of recovery because I think my bootloader is defective.
For example from a cold restart if I press the power button for say 3 -5 seconds it wont boot, just boot to the Essential logo and loop. To get the phone to boot I have to hold the power down for 15-20 seconds while it bootloops a couple times then it'll boot.
Is there a possible way to reflash the bootloader software if it is defective? It's unlocked btw
There is a way to install magisk via fastboot with a patched_boot img which I'm working on. Cant seem to find the right boot img to patch for 8.1
PS Is it possible to flash .zips through fastboot? e.g. custom roms etc

Was finally able to get into recovery, so all is well. Thanks for the help yall

OP, what was your process to successfully get into recovery and fix your problems?
It may help others sometime?

gimpy1 said:
OP, what was your process to successfully get into recovery and fix your problems?
It may help others sometime?
Click to expand...
Click to collapse
It's really hard to say, my phone has a serious problem with it. sometimes I cant get it to boot, it will boot into the bootloader over and over and over. I've managed to get Lineage 15.1 on if for a bit until I tried to get back into the recovery which sent it manic.
I just got lucky I was able to get into TWRP and flash lineage.
my first issue not being able to flash the stock image via fastboot because I didn't unlock_critical which can sometimes fail when the usb connection is bad.
Currently flashing stock again if my phone will boot up. I'm not sure whats wrong with my bootloader but its causing a ton of havoc

My essential phone stuck in boot logo,bootloader work but recovery doesn´t work
Bootloader locked.
Oem unlocking disable.
Usb debugging disable.
How to flash stock recovery or twrp on bootloader locked ? please
Thank you!

katastyle971 said:
My essential phone stuck in boot logo,bootloader work but recovery doesn´t work
Bootloader locked.
Oem unlocking disable.
Usb debugging disable.
How to flash stock recovery or twrp on bootloader locked ? please
Thank you!
Click to expand...
Click to collapse
Same boat for me - just keep rebooting to show Powered by Android Screen and then reboot again and again. Was able to see my device using fastboot devices command but all attempts to access recory just repeat the bootloop entry. I would happily check the OEM UNLOCK option in dev settings but can't even get it to book to any OS to make that option happen. Still shows bootloader locked on bootloader screen - any help someone can suggest?

I had this problem tonight also. In my case I suspect it had to do with the install of magisk in which I checked both boxes and patched the bootloader. on reboot I was stuck on boot. Just wanted to add my solution. I got the pie back to stock zip here https://forum.xda-developers.com/essential-phone/development/stock-7-1-1-nmj20d-t3701681 then I put it into the adb folder and ran the flashall.bat script. I tried the no wipe one and it saved my information. very happy I didnt have to resetup my phone in the end.

katastyle971 said:
My essential phone stuck in boot logo,bootloader work but recovery doesn´t work
Bootloader locked.
Oem unlocking disable.
Usb debugging disable.
How to flash stock recovery or twrp on bootloader locked ? please
Thank you!
Click to expand...
Click to collapse
I am in the same boat. I tried to re-install the OS, but because my USB debugging was not enabled, Fastboot worked but ADB would not and since I basically wiped the recovery area, my phone will only boot into Fastboot but will not allow any loading of recovery. I would pay for someone to help. This is so hard to figure out. I have contacted Essential but since my phone is over 12 months old, the warranty has expired.
Help please. It seems like such a waste to have a bricked phone.

Failed Update from 10.3.12 to 11 - Assistance Appreciated

Attempted to update from the latest stable 10.3.12 to 11 by flashing the full OTA zip in TWRP.
Install failed and phone locked up.
Attempting to boot to recovery or system results in Qualcomm Crashdump Mode.
I can get to Fastboot, but I'm not sure if I should try flashing twrp.img or pull boot.img from the OTA or what.
Anyone have any suggestions?

SMcC2 said:
Attempted to update from the latest stable 10.3.12 to 11 by flashing the full OTA zip in TWRP.
Install failed and phone locked up.
Attempting to boot to recovery or system results in Qualcomm Crashdump Mode.
I can get to Fastboot, but I'm not sure if I should try flashing twrp.img or pull boot.img from the OTA or what.
Anyone have any suggestions?
Click to expand...
Click to collapse
An attempt to flash TWRP and reflashing should go.

Hi,
I'm having kinda same issue.
I'm on stable A11 oneplus 6t,
i'm trying to boot into twrp in order to install new recovery and root with magisk.
when fasboot boot twrp.img i'm getting a qualcomm crashdump.
tried different twrp img's with no success..
maybe someone figure it out?
thanks

BenoMosko said:
Hi,
I'm having kinda same issue.
I'm on stable A11 oneplus 6t,
i'm trying to boot into twrp in order to install new recovery and root with magisk.
when fasboot boot twrp.img i'm getting a qualcomm crashdump.
tried different twrp img's with no success..
maybe someone figure it out?
thanks
Click to expand...
Click to collapse
I did not have time to wait so before bed I just reset everything.
I ended up using the MSM tool located here:
The Complete Guide to Unbrick OnePlus 6/6T from a Hard-Brick using MSMDownload Tool
Unlocked bootloader, installed TWRP & Magisk, installed A11 zip, everything is working again now.
Good luck!

BenoMosko said:
Hi,
I'm having kinda same issue.
I'm on stable A11 oneplus 6t,
i'm trying to boot into twrp in order to install new recovery and root with magisk.
when fasboot boot twrp.img i'm getting a qualcomm crashdump.
tried different twrp img's with no success..
maybe someone figure it out?
thanks
Click to expand...
Click to collapse
Hey, I'm having the same issue. Did you end up figuring out how to solve this?

Artificial_Intelligence said:
Hey, I'm having the same issue. Did you end up figuring out how to solve this?
Click to expand...
Click to collapse
Flash temporary recovery first ( lineage recovery ) then from fastboot.. boot into recovery.
You will see lineage recovery.
Select apply update - > update from adb ....
Then "adb sideload <twrp image>.img...
(probably it ask to verify choose yes)
Go back select advanced restart ( not sure the right word ) -> reboot to recovery.
Then you will have twrp installed.
If you only want to root why not flash magiskpatched image there no need TWRP just to root.

s.seila said:
Flash temporary recovery first ( lineage recovery ) then from fastboot.. boot into recovery.
You will see lineage recovery.
Select apply update - > update from adb ....
Then "adb sideload <twrp image>.img...
(probably it ask to verify choose yes)
Go back select advanced restart ( not sure the right word ) -> reboot to recovery.
Then you will have twrp installed.
If you only want to root why not flash magiskpatched image there no need TWRP just to root.
Click to expand...
Click to collapse
Hm but how would I install lineage recovery? Flashing recovery through fastboot doesn't work on the new devices anymore right?
I also tried booting lineage recovery without flashing but that also didn't work (although it didn't get stuck on crashdump but booted into the regular OS instead).
I did notice that it seems to be related to OOS 11 firmware. On 10 booting into TWRP works just fine and as soon as I upgrade to 11 it stops working (maybe this means it's fixable?). What I used as a workaround for now is to have 10 firmware in one slot, upgrade other slot to 11 and flash TWRP to both slots from the 10 slot. Seems to work so far but is not ideal IMO. I'm not a developer sadly but maybe someone smarter than me will come up with a solution.

What do you mean by "new device"?? New OOS version right??
I use this method all the time with oos 11.x.x.x.x to install TWRP so i can install Custom ROM later.
no need to go to oos 10 you can flash it from newest oos11.
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First boot into fastboot mode.
to install lineage recovery
fastboot flash boot <lineage recovery image>.img
download from here https://download.lineageos.org/fajita
menualy select and boot to recovery. It will boot to lineage recovery.

lmao it appear in two posts. deleted 1.

Help! stuck post unlocking bootloader

So i was just following the instructions from this page https://wiki.lineageos.org/devices/flox/install, was able to unlock the bootloader of my nexus 7 device. Now at this point i didnt know my device codename, i thought it was flox but i just noticed on the bootloader page it says deb. [Im a noob..guilty]
Now the 2nd step was no biggie either, i was able to flash twrp recovery, but somehow it was not working as i was keep getting error 1 and vendor invalid argument when i tried to flash the lineage 18.1 zip.
The recovery img i tried were
lineage-18.1-20211018-recovery-flox.img
twrp-3.4.0-0-deb.img
twrp-3.5.0_9-0-flox.img
twrp-3.5.2_9-0-flo.img
twrp-3.5.2_9-0-flo_followmsi.img
Now after flashing twrp recoveries i was getting the problem of not able to flash the LOS 18.1 rom file, plus if i would format the device and then try to reboot the device back to recovery i would get an error with android logo collapsed [check the image]
what am i doing wrong? plz help.
I sense its repartitioning process? also i am not sure if i did an EFS Persists back up.
so if someone can give a walkthrough. would be very greatful _/\_
thanks again

Was your device rooted? Start it in to recovery mode, go to "Mount". And see if you could chose system directory. If not, that means TWRP can't access system directory and will not be able to flash any custom ROM until you sort root permissions.
Edit: Sorry just now noticed that you can't get in to recovery mode anymore. Connect your device to computer and use Nexus Root Toolkit to flash TWRP recovery.