Develop Bugs

Unable to recover OxygenOS on Oneplus3

Hello everyone,
This morning, I wanted to recover OxygenOS on my Oneplus3. I'm currently running Cyanogenmod 13.
I used the following guide: "[GUIDE] How to Unroot your OnePlus 3 / 3T and go back completely to stock" (Since I'm a newb, I can't post the link. But Google will get you there)
I booted into fastboot, issued the fastboot flash recovery recovery_op3.img and fastboot oem lock commands from my Linux termina, and rebooted in recovery mode.
In recovery mode, I then erased the cache and all that, selected the "Upgrade android from USB" and issued the adb sideload ota.zip command. This is where my problems began.
After running the command, I got the error "error: protocol fault (no status)". I tried to look this error up, but couldn't find useful information.
I started to panic a bit, fearing that my phone would be bricked. However, after booting back into fastboot mode, unlocking OEM, and rebooting, my phone would boot back into Cyanogenmod 13 (A clean install).
So now I don't have a bricked phone. However, I really would like to go back to OxygenOS, so my question is whether anyone knows how to solve my problem.
Summary:
Running Linux (Debian 8) on my PC;
Running Cyanogenmod13 on my Phone;
Want to recover OxygenOS, but adb sideload gave me "error: protocol fault (no status)";
Tried running the adb sideload command as root, however that did not work;
Can still use the Cyanogenmod13.

I've seen that error once before. I had to disconnect the phone, kill the ADB process, reconnect the phone and restart ADB to get it to work.
That worked for me. Hope that helps.
Sent from my OnePlus 3 using XDA Labs

Tybalt said:
I've seen that error once before. I had to disconnect the phone, kill the ADB process, reconnect the phone and restart ADB to get it to work.
That worked for me. Hope that helps.
Sent from my OnePlus 3 using XDA Labs
Click to expand...
Click to collapse
Hey, thanks for responding.
I forgot to mention that I also tried killing the adb process several times, using the adb kill-server command and by killing the process sending SIGKILL.
Another thing I tried was using another Debian machine, which is my laptop. Still, those things did not solve my issue.

Never relock your boot loader, most bricks are due to relocking.
Flash twrp, flash oxygen os ,boot, enable everything,if you want complete stock, flash stock recovery ,flash oxygen os boot to complete stock os.

Backup youre working rom..
First, you need unlocked bootloader.
1.Flash twrp 3.0.4.1 or twrp-3.1.0 x v.26 blu_spark. Reboot to recovery.
2.Clean flash (wipe data-dalvik-system-cache) Oxygen OS, since you come from a custom rom. Flash SuperSu or Magisk, if you want root. Reflash recovery. Reboot to recovery.
If youre phone does not boot in recovery, press Power till phone vibrates. Press vol. down & choose:
1. Select Bootloader. Flash recovery from PC. Safest way to flash recovery.
or
2.Select recovery. Reflash recovery. Reboot recovery.
After you are sure that you got a working recovery reboot to system.

null0seven said:
Backup youre working rom..
First, you need unlocked bootloader.
1.Flash twrp 3.0.4.1 or twrp-3.1.0 x v.26 blu_spark. Reboot to recovery.
2.Clean flash (wipe data-dalvik-system-cache) Oxygen OS, since you come from a custom rom. Flash SuperSu or Magisk, if you want root. Reflash recovery. Reboot to recovery.
If youre phone does not boot in recovery, press Power till phone vibrates. Press vol. down & choose:
1. Select Bootloader. Flash recovery from PC. Safest way to flash recovery.
or
2.Select recovery. Reflash recovery. Reboot recovery.
After you are sure that you got a working recovery reboot to system.
Click to expand...
Click to collapse
Thanks for responding.
Since I don't understand everything yet, I will spend this evening looking up everything in detail, before I start giving it another try. Do you perhaps know of a tutorial about this specific situation? I don't want to bother you by questioning everything you stated in your instructions. They seem clear enough to be able to be looked up on Google :laugh:
drmuruga said:
Never relock your boot loader, most bricks are due to relocking.
Flash twrp, flash oxygen os ,boot, enable everything,if you want complete stock, flash stock recovery ,flash oxygen os boot to complete stock os.
Click to expand...
Click to collapse
Thanks for responding.
By the steps after "if you want complete stock", do you mean that I should keep the bootloader unlocked, and then perform the same steps as in the tutorial that I used?
EDIT:
@ null0seven: I found these steps online as I was looking up some things you said (I don't have much time since I will celebrate eastern with my family today)
Rooted Users or users with ROMs other than OxygenOS having new bootloader (Official CM 13,CM 13 Based ROMs dated later than 04 June 2016,H2OS Marshmallow)​
Step 1 :- Download the OxygenOS 3.0.2 full zip from the top of the post.
Step 2 :- Boot into TWRP.Wipe Dalvik,System,Data and Cache.After that,flash OxygenOS 3.0.2.
Step 3 :- [OPTIONAL] Flash SuperSU from here :- https://www.androidfilehost.com/?fid=24459283995297946
Step 4 -> Reboot System.
Of course, this is about an old version of OxygenOS. But it looks the same as you said.
I think this, combined with your instructions, will make it a bit clearer. Still one question: What do you mean exactly by flashing?

dvbeck
https://forum.xda-developers.com/oneplus-3/how-to/oneplus-3-how-to-unlock-bootloader-t3398733

Unbricking after a hard brick not working out.

So my OP3 got bricked and I used @Naman Bhalla guide to unbrick my phone using the second method which flashes an old OOS after unbrick. I was successful in unbricking my phone, however once the phone restarts after the unbrick tool it gets stuck in the OOS boot animation (The rotating O animation) and then it reboots and this continues.
I've tried,
1) Sideloading another Stock ROM (OOS 5.0.1.) via stock recovery: Just rebricks my phone
2) Flashing TWRP 3.1.0-0 and tried to install zip for 5.0.1 : TWRP does't recognize phone, (ERROR 7, This ROM is for OnePlus 3, This device is " ") and thus it doesn't flash.
3) Tried upgrading TWRP to 3.2.1. : could'nt do it - Lost recovery, phone just restarts to a black screen with white notification light.
4) Tried flashing OOS 4.5.1 (Nougat) via TWRP 3.1.: Does't boot up. Doesn't even go to the animation and restarts after OnePlus Logo.
Yes, I was stupid enough to not have done a nandroid backup. Desperately need help.

yawarkhalid said:
So my OP3 got bricked and I used @Naman Bhalla guide to unbrick my phone using the second method which flashes an old OOS after unbrick. I was successful in unbricking my phone, however once the phone restarts after the unbrick tool it gets stuck in the OOS boot animation (The rotating O animation) and then it reboots and this continues.
I've tried,
1) Sideloading another Stock ROM (OOS 5.0.1.) via stock recovery: Just rebricks my phone
2) Flashing TWRP 3.1.0-0 and tried to install zip for 5.0.1 : TWRP does't recognize phone, (ERROR 7, This ROM is for OnePlus 3, This device is " ") and thus it doesn't flash.
3) Tried upgrading TWRP to 3.2.1. : could'nt do it - Lost recovery, phone just restarts to a black screen with white notification light.
4) Tried flashing OOS 4.5.1 (Nougat) via TWRP 3.1.: Does't boot up. Doesn't even go to the animation and restarts after OnePlus Logo.
Yes, I was stupid enough to not have done a nandroid backup. Desperately need help.
Click to expand...
Click to collapse
Try with eng.stk's TWRP: https://forum.xda-developers.com/devdb/project/?id=15934#downloads
Item 5 in the list.

tnsmani said:
Try with eng.stk's TWRP: https://forum.xda-developers.com/devdb/project/?id=15934#downloads
Item 5 in the list.
Click to expand...
Click to collapse
Gave this a shot. Not booting up again. Goes to blank screen with white notification light.

Update: I've even tried rooting phone and flashing custom rom: Doesn't even go to animation
I've also tried method 1, erased the system via fastboot and reflashed the official OOS 3.1.2. zip file via adb sideload. Still the same result on official zip.

yawarkhalid said:
Update: I've even tried rooting phone and flashing custom rom: Doesn't even go to animation
I've also tried method 1, erased the system via fastboot and reflashed the official OOS 3.1.2. zip file via adb sideload. Still the same result on official zip.
Click to expand...
Click to collapse
If Method 2 doesn't work, Method 1 will definitely not work.
After flashing TWRP, are you able to boot to it (without flashing any ROM)? Flashing OOS or Open Beta will overwrite TWRP. So try this: wipe everything and flash TWRP, boot to TWRP and flash ROM and again TWRP, then flash Magisk and boot to system.
When you get white LED, hold power button for 7 to 10 seconds, it will switch off. Then press power button again and you will boot to the options menu to choose bootloader, recovery etc. You may not have to use Method 2 every time if this works for you.

tnsmani said:
If Method 2 doesn't work, Method 1 will definitely not work.
After flashing TWRP, are you able to boot to it (without flashing any ROM)? Flashing OOS or Open Beta will overwrite TWRP. So try this: wipe everything and flash TWRP, boot to TWRP and flash ROM and again TWRP, then flash Magisk and boot to system.
When you get white LED, hold power button for 7 to 10 seconds, it will switch off. Then press power button again and you will boot to the options menu to choose bootloader, recovery etc. You may not have to use Method 2 every time if this works for you.
Click to expand...
Click to collapse
Hey thanks for the help. Will give this a shot now. Can you tell me what method I should use to flash magisk?
Also, I am able to access TWRP but when flashing a rom via TWRP it gives me error 7 i.e. can't install this since because it is for OnePlus 3 this device is " ". Also, with method 2 I already have a stock rom installed, I've tried wiping system via fastboot and sideloading another ROM too, that doesn't work.

yawarkhalid said:
Hey thanks for the help. Will give this a shot now. Can you tell me what method I should use to flash magisk?
Also, I am able to access TWRP but when flashing a rom via TWRP it gives me error 7 i.e. can't install this since because it is for OnePlus 3 this device is " ". Also, with method 2 I already have a stock rom installed, I've tried wiping system via fastboot and sideloading another ROM too, that doesn't work.
Click to expand...
Click to collapse
Magisk to be flashed through TWRP.
If you know how, remove this first line from the updater script and then flash it: getprop("ro.build.product") == "OnePlus3" || abort("This package is for "OnePlus3" devices; this is a "" + getprop("ro.build.product") + ""."); This is what is preventing TWRP from flashing the ROM. Removing this line will result in no checks for device type while flashing the ROM.

tnsmani said:
Magisk to be flashed through TWRP.
If you know how, remove this first line from the updater script and then flash it: getprop("ro.build.product") == "OnePlus3" || abort("This package is for "OnePlus3" devices; this is a "" + getprop("ro.build.product") + ""."); This is what is preventing TWRP from flashing the ROM. Removing this line will result in no checks for device type while flashing the ROM.
Click to expand...
Click to collapse
Hi, already did that, still is't flashing.
Lastly, I managed to lock my bootloader now somehow by running the 3.0.8 version of the MSMTool. Now I have no working OS, A locked bootloader and no way to flash TWRP. I should should throw my phone in the garbage now. Shouldnt I? :crying:

yawarkhalid said:
Hi, already did that, still is't flashing.
Lastly, I managed to lock my bootloader now somehow by running the 3.0.8 version of the MSMTool. Now I have no working OS, A locked bootloader and no way to flash TWRP. I should should throw my phone in the garbage now. Shouldnt I? :crying:
Click to expand...
Click to collapse
NEVER GIVE UP, atleast not so soon. Contact OnePlus and ask them for a remote session, they may be able to restore it.
Though you are not able to flash TWRP, you can boot TWRP by using the adb command "fastboot boot twrp.img" and then play with it. Place the TWRP within the adb folder while trying this. (Replace twrp.img with the name of your TWRP or rename your TWRP as twrp.img)
Either you have encryption issues or you have a hardware issue if you are not able to flash anything successfully.
This is the end of my knowledge.

Take a look here:
https://forums.oneplus.com/threads/guide-mega-unbrick-guide-for-a-hard-bricked-oneplus-3.452634/
or here:
https://forums.oneplus.com/threads/guide-oneplus-3-3t-unbrick.531047/

jeffrey268 said:
Take a look here:
https://forums.oneplus.com/threads/guide-mega-unbrick-guide-for-a-hard-bricked-oneplus-3.452634/
or here:
https://forums.oneplus.com/threads/guide-oneplus-3-3t-unbrick.531047/
Click to expand...
Click to collapse
ummm thanks jeffery. But that tool is exactly what i've been using and what isn't working for me in ways i mentioned above. Thanks though.

tnsmani said:
NEVER GIVE UP, atleast not so soon. Contact OnePlus and ask them for a remote session, they may be able to restore it.
Though you are not able to flash TWRP, you can boot TWRP by using the adb command "fastboot boot twrp.img" and then play with it. Place the TWRP within the adb folder while trying this. (Replace twrp.img with the name of your TWRP or rename your TWRP as twrp.img)
Either you have encryption issues or you have a hardware issue if you are not able to flash anything successfully.
This is the end of my knowledge.
Click to expand...
Click to collapse
Gives me the error, "Unlock device to use this command"
I am able to flash rom via MSMTool, it even dash charges and all. But I can't boot into the system. It gets stuck in OOS animation while booting. Been at it for 3 days. Can it really be a hardware issue if my bootloader and recovery both are working?
Lastly, do you have any way I could unlock the bootloader without system permissions?

Putting an end to this madness. after 4 days in front of my laptop. Had a remote session with a OnePlus tech support team. Discarding my phone unfortunately. Thinking of shifting to a Xiaomi Redmi Note 5 Pro since I can't afford a OnePlus 5T anymore. Thanks to everyone who helped. This thread can be closed now.

rooting and twrp and custom roms

Hi so I just got this device from a friend. It is completely up to date running pie and Nov security.
I am coming from Nexus 6p. So a/b partitions are new to me.
So is the root process the same as it was for 6p?.
First unlock the bootloader. Then install latest twrp with fastboot
Then flash magisk.
Then after that install custom roms, kernels, ect?
Or is the a/b partition thing make things different?

mojorisin7178 said:
Hi so I just got this device from a friend. It is completely up to date running pie and Nov security.
I am coming from Nexus 6p. So a/b partitions are new to me.
So is the root process the same as it was for 6p?.
First unlock the bootloader. Then install latest twrp with fastboot
Then flash magisk.
Then after that install custom roms, kernels, ect?
Or is the a/b partition thing make things different?
Click to expand...
Click to collapse
Go here: [Guide] Pixel XL Android 9.0.0 (Pie) Unlock/Lock Bootloader + Install Stock Images/Custom kernels/TWRP Recovery/Systemless ROOT + October 2018 Security Patch
Do #7 or #8 to Root/Reroot.
If you want to install a Custom ROM see Custom ROM section.

You pretty much got it. You can't flash twrp from bootloader no more. Out have to "fastboot boot twrp.img" which will get you temporarily into twrp, and if you want a permanent install you can flash the installer while in twrp

noidea24 said:
You pretty much got it. You can't flash twrp from bootloader no more. Out have to "fastboot boot twrp.img" which will get you temporarily into twrp, and if you want a permanent install you can flash the installer while in twrp
Click to expand...
Click to collapse
What? Please explain how you flashed twrp from the bootloader?

Go-to twrp website, and then tbe section for our phone "marlin". You'll see a twrp installer .zip file, and another twrp .img file.
Download the latest of the installer zip and the twrp img.
Commands will be
"Fastboot boot (filename).img"
Then when in twrp, go-to advanced, adb sideload and run the command "adb sideload (filename).zip"

Tell us how ya got Nov security when it has not been released for the Pixel....lol

noidea24 said:
You pretty much got it. You can't flash twrp from bootloader no more. Out have to "fastboot boot twrp.img" which will get you temporarily into twrp, and if you want a permanent install you can flash the installer while in twrp
Click to expand...
Click to collapse
homeboy76 said:
What? Please explain how you flashed twrp from the bootloader?
Click to expand...
Click to collapse
noidea24 said:
Go-to twrp website, and then tbe section for our phone "marlin". You'll see a twrp installer .zip file, and another twrp .img file.
Download the latest of the installer zip and the twrp img.
Commands will be
"Fastboot boot (filename).img"
Then when in twrp, go-to advanced, adb sideload and run the command "adb sideload (filename).zip"
Click to expand...
Click to collapse
Wasn't expecting an answer to the question, because I always flash twrp from bootloader/fastboot mode. Do you still sideload twrp.zip to install twrp, instead of flashings it with twrp

crackerjack1957 said:
Tell us how ya got Nov security when it has not been released for the Pixel....lol
Click to expand...
Click to collapse
Sorry my bad I am on October security not November. My 6p is on November and I just got this phone so I just got confused for a second.

You can just transfer the zip to your phone, and after booting the twrp.IMG you will be able to install it like a normal zip.

Pixel 2 XL Root [Going Mad About]

Hi everyone,
I'm going mad about Pixel 2 XL Root. I'm Trying to use Magisk v18 on latest Android versione but I'm not able to root the device.
Everytime I try to flash Magisk the screen stays loading Google Icon in loop forever and ever. I've tried every guide on the web whitout success.
Anyone can help me?
[Edit]
Theese are the steps i take
-flash recovery twrp (ok)
-reboot to recovery (ok)
-flash magisk v18 (loop)

megamarini said:
Hi everyone,
I'm going mad about Pixel 2 XL Root. I'm Trying to use Magisk v18 on latest Android versione but I'm not able to root the device.
Everytime I try to flash Magisk the screen stays loading Google Icon in loop forever and ever. I've tried every guide on the web whitout success.
Anyone can help me?
Click to expand...
Click to collapse
All the usual preemptive steps are complete, correct? You OEM unlocked it and all that?

djcrystals said:
All the usual preemptive steps are complete, correct? You OEM unlocked it and all that?
Click to expand...
Click to collapse
Sure mate, I have rooted every smartphone owned since Xperia X8 and this is a very strange behaviour for me.

megamarini said:
Sure mate, I have rooted every smartphone owned since Xperia X8 and this is a very strange behaviour for me.
Click to expand...
Click to collapse
Don't feel too bad my friend, the P2XL is a quirky little bugger to say the least. I had a heck of a time rooting 9.0 after I updated from 8.1, then outa the blue, it worked. Here's a few steps to try.
1. Fastboot twrp, then flash magisk, try to boot.
2. Fastboot twrp, flash twrp.zip, boot up, then go back to twrp and flash magisk. If no go, do the same steps, except after you flash magisk, flash the magisk uninstaller zip, then flash magisk again.
3. Fastboot into twrp, flash twrp.zip, custom kernel.zip, then magisk.zip. if no go, then try the magisk uninstaller.zip method again.
4. Stick with it, be patient, sooner or latter you'll find the right combo. Also, it seems easier to root using a custom kernel, if your willing to try it :good:

Badger50 said:
Don't feel too bad my friend, the P2XL is a quirky little bugger to say the least. I had a heck of a time rooting 9.0 after I updated from 8.1, then outa the blue, it worked. Here's a few steps to try.
1. Fastboot twrp, then flash magisk, try to boot.
2. Fastboot twrp, flash twrp.zip, boot up, then go back to twrp and flash magisk. If no go, do the same steps, except after you flash magisk, flash the magisk uninstaller zip, then flash magisk again.
3. Fastboot into twrp, flash twrp.zip, custom kernel.zip, then magisk.zip. if no go, then try the magisk uninstaller.zip method again.
4. Stick with it, be patient, sooner or latter you'll find the right combo. Also, it seems easier to root using a custom kernel, if your willing to try it :good:
Click to expand...
Click to collapse
Thank You mate, when I'll get home I'll try to follow yor steps and I'll let you know. Any suggestion about kernel on stock firmware? ElementalX it's ok?

Had the SAME problem yesterday:
Fastbooted TWRP
Flashed TWRP
Flashed Magisk
---> STUCK
Flashed TWRP
Flashed Magisk
---> BOOTED UP

Sui77 said:
Had the SAME problem yesterday:
Fastbooted TWRP
Flashed TWRP
Flashed Magisk
---> STUCK
Flashed TWRP
Flashed Magisk
---> BOOTED UP
Click to expand...
Click to collapse
Tryed everything but nothing works..

megamarini said:
Tryed everything but nothing works..
Click to expand...
Click to collapse
Maybe give the guide linked in my sig a shot.
If that doesn't help, try the following:
-once you've permanently installed TWRP, try rebooting to recovery after each additional step BEFORE rebooting to system:
install cust kernel, reboot to recovery, reboot to system
install magisk, reboot to recovery, reboot to system
if that doesn't work, try doing a mass install after TWRP is permanently installed:
in the same flash, install cust kernel and magisk, reboot to system
These have helped other users who have had odd issues with their set ups, but in the end, Pixel 2 XL is a fickle beast
Best of luck!

Az Biker said:
Maybe give the guide linked in my sig a shot.
If that doesn't help, try the following:
-once you've permanently installed TWRP, try rebooting to recovery after each additional step BEFORE rebooting to system:
install cust kernel, reboot to recovery, reboot to system
install magisk, reboot to recovery, reboot to system
if that doesn't work, try doing a mass install after TWRP is permanently installed:
in the same flash, install cust kernel and magisk, reboot to system
These have helped other users who have had odd issues with their set ups, but in the end, Pixel 2 XL is a fickle beast
Best of luck!
Click to expand...
Click to collapse
SOLVED
The only way (for me) to root my Pixel 2 XL is follow theese steps:
Rooting with Magisk
NOTE #4: This section assumes you are not going to install TWRP. If you are, skip to the next section and just flash the latest Magisk zip after installing TWRP.
Download the Magisk zip from the official thread and install the manager from the zip.
Grab a boot image to patch (either the one from the latest factory image or a custom kernel one) and push it to your device:
Code:
adb push <path_to_file> /sdcard/Download
Open Magisk Manager and click the Install button.
Click "Install" at the first prompt then choose "Patch Boot Image File". A file manager will pop up.
Select the boot image you want to patch and let Magisk Manager patch it.
Pull it off your device:
Code:
adb pull /sdcard/MagiskManager/patched_boot.img
Reboot into the bootloader:
Code:
adb reboot bootloader
Flash the boot image and reboot.
Code:
fastboot flash boot patched_boot.img
fastboot reboot
Open Magisk Manager and you should be rooted!
Source: XDA Post
Thank you so much to everyone who tried to help me!

Unable to boot into TWRP recovery (twrp-3.2.3-1 dumpling/OOS 9.0.3 Pie)

Hey Guys,
somehow, I seem to be too dumb to install TWRP to my new dumpling. I did the following:
- run the official updates (9.0.3 Pie)
- unlock the bootloader using adb
- successfully flash the latest TWRP recovery (twrp-3.2.3-1 dumpling from their HP)
So far, no problems at all. Then I booted directly into recovery, so it won't be overwritten again: I tried unplug + Power/Volume Down, command "fastboot reboot recovery" and selecting recovery from the menu. But everytime I end up with the beautiful stock recovery, I never even saw the TWRP interface.
Any suggestions ? Any help would be much appreciated!!
My only idea: The latest TWRP is from 08/2018, maybe its not compatible to Pie ?!

_Kingo said:
Hey Guys,
somehow, I seem to be too dumb to install TWRP to my new dumpling. I did the following:
- run the official updates (9.0.3 Pie)
- unlock the bootloader using adb
- successfully flash the latest TWRP recovery (twrp-3.2.3-1 dumpling from their HP)
So far, no problems at all. Then I booted directly into recovery, so it won't be overwritten again: I tried unplug + Power/Volume Down, command "fastboot reboot recovery" and selecting recovery from the menu. But everytime I end up with the beautiful stock recovery, I never even saw the TWRP interface.
Any suggestions ? Any help would be much appreciated!!
My only idea: The latest TWRP is from 08/2018, maybe its not compatible to Pie ?!
Click to expand...
Click to collapse
hi dude, to stay on TWRP you have to flash MAGISK, if not TWRP will always be overwritten by the StockRecovery!!
flash TWRP
reboot into TWRP
flash Magisk within TWRP
reboot system
happy flashing!

nicorvienne said:
hi dude, to stay on TWRP you have to flash MAGISK, if not TWRP will always be overwritten by the StockRecovery!!
flash TWRP
reboot into TWRP
flash Magisk within TWRP
reboot system
happy flashing!
Click to expand...
Click to collapse
Hi, thanks, but I think you did not understand my problem: I can't reboot into TWRP. Instead I end up in stock, no matter what I do...

_Kingo said:
Hi, thanks, but I think you did not understand my problem: I can't reboot into TWRP. Instead I end up in stock, no matter what I do...
Click to expand...
Click to collapse
hi dude, sorry - now i got you
# after flashed TWRP unplug your device and reboot directly into the bootloader-mode (‘Volume Up’ + ‘Power’ button altogether) and navigate to 'Recovery' or
# fastboot boot 'recovery.img'
i recommend flashing twrp-3.2.3-x_blu_spark_v9.91_treble-op5_op5t.img : https://github.com/engstk/android_device_oneplus_cheeseburger/releases

SOLVED
I tried the 9.x recovery from this thread:
https://forum.xda-developers.com/oneplus-5t/development/recovery-twrp-3-2-1-0-oreo-8-0-8-1-t3729673
works like a charm!
I thougth, the official TWRP site would be the best source, but well... lesson learnt. Anyway, thanks for trying to help, nicorvienne

_Kingo said:
Hey Guys,
somehow, I seem to be too dumb to install TWRP to my new dumpling. I did the following:
- run the official updates (9.0.3 Pie)
- unlock the bootloader using adb
- successfully flash the latest TWRP recovery (twrp-3.2.3-1 dumpling from their HP)
So far, no problems at all. Then I booted directly into recovery, so it won't be overwritten again: I tried unplug + Power/Volume Down, command "fastboot reboot recovery" and selecting recovery from the menu. But everytime I end up with the beautiful stock recovery, I never even saw the TWRP interface.
Any suggestions ? Any help would be much appreciated!!
My only idea: The latest TWRP is from 08/2018, maybe its not compatible to Pie ?!
Click to expand...
Click to collapse
try this.
https://forum.xda-developers.com/oneplus-5t/development/root-install-twrp-xposed-framework-t3910141

Newbie needs help twrp
I am having the same problem and I have tried everything I unlock bootloader and flash TWRP successfully except I can never get into TWRP I try the key combo I tried to use the fastboot command all it does is it brings me back to fastboot mode how can I get to twrp with my new OnePlus 5T

[email protected] said:
I am having the same problem and I have tried everything I unlock bootloader and flash TWRP successfully except I can never get into TWRP I try the key combo I tried to use the fastboot command all it does is it brings me back to fastboot mode how can I get to twrp with my new OnePlus 5T
Click to expand...
Click to collapse
try to flash an older version of twrp through "ADB minimal fast boot".

I use Twrp and am not using Magisk or rooted.