Stuck in Fastboot Mode / TWRP without OS

[elchico92]

Hello people,

I have an OnePlus 3T, which does not start the OS. I can open Fastboot Mode or TWRP. I do not even know which OS is installed (I think stock rom, but do not know). When I boot into Fastboot, I get the dm-verity notification "Phone is unlocked and cannot be trusted". When I boot into system, it stops at the black "Powered by android" Screen (very first screen).
When I connect my phone to the PC and open the internal storage, it shows only the "TWRP" folder.

So what Information do I have so far (with my amateur knowledge):
adb shell getprop ...
ro.build.version.release: 6.0.1
ro.build.version.sdk: 23
ro.build.display.id: omni_oneplus3-eng 6.0.1 MOB31K eng.jc.20170208.012427 test-keys
ro.modversion: OmniROM-6.0.1-20170208-oneplus3-HOMEMADE
ro.twrp.version: 3.0.4-1

When I start the bootloader:
Product_Name - msm8996
Variant - MTP UFS
Bootloader Version -
Baseband Version -
Serial Number - *****
Secure Boot - enabled
Device State - unlocked

I tried to reflash the original recovery => device did not start in recovery anymore => reflashed twrp
I tried to flash the stock ROM => did not work (with this Error 7)

So my first question: Which OS do I have? Really Marshmallow 6.0.1?
Second: Do you need more infos?
Third and most important: How to repair this mess?

What do I want: A stable, rooted ROM. It can be the stock ROM, but also a custom, I do not care right now.
I read that this unlocked-notification appears because I have the wrong kernel? Is that true? Which one do I need?


Thank you very much for your help.

 

[thes3usa]

Use ADB Sideload to Sideload a ROM onto the phone since you have TWRP working. It's not a huge problem, and it's easily solvable.
*OR* you can use the Unbrick tool to solve your problem.

 

[elchico92]

Use ADB Sideload to Sideload a ROM onto the phone since you have TWRP working. It's not a huge problem, and it's easily solvable.
*OR* you can use the Unbrick tool to solve your problem.

Thank you for your reply.
Okay so it is not important which system I run right now? And what about this kernel thing?
I can just flash it with sideload (e.g. https://forum.xda-developers.com/on...pment/rom-kernel-resurrectionremix-n-t3524715) and finished? Rooted and particularly working?

Sorry for the questions but I am a little nervous

 

[thes3usa]

Thank you for your reply.
Okay so it is not important which system I run right now? And what about this kernel thing?
I can just flash it with sideload (e.g. https://forum.xda-developers.com/on...pment/rom-kernel-resurrectionremix-n-t3524715) and finished? Rooted and particularly working?

Sorry for the questions but I am a little nervous

You may want to Sideload the latest Firmware too, Open Beta 21 that is. And then Sideload a Nougat ROM. Don't sideload any GAPPs.

 

[elchico92]

You may want to Sideload the latest Firmware too, Open Beta 21 that is. And then Sideload a Nougat ROM. Don't sideload any GAPPs.

So first this one (downloads.oneplus.net/oneplus-3t/oneplus_3t_oxygenos_openbeta_21/), then this (androidfilehost.com/?w=files&flid=131965 - latest)?

Thanks again!

PS: Sorry I cannot post links yet.

 

[thes3usa]

So first this one (downloads.oneplus.net/oneplus-3t/oneplus_3t_oxygenos_openbeta_21/), then this (androidfilehost.com/?w=files&flid=131965 - latest)?

Thanks again!

PS: Sorry I cannot post links yet.

Nope, that's the complete stock Zip. Unless you want to install OOS, that's not the one to Sideload.
Download the FW only from here: https://forum.xda-developers.com/oneplus-3t/how-to/firmware-beta-10-t3631166
And then Sideload it, reboot back to recovery, and then Sideload the ROM.

 

[redpoint73]

When I connect my phone to the PC and open the internal storage, it shows only the "TWRP" folder.

What is in the TWRP folder, anything? The TWRP folder would normally only be created, if a backup was created. You can possibly just boot TWRP, select the RESTORE option, select the backup from the TWRP folder, and get the phone up and running again.

Another possibility, if you aren't that up on adb commands (sideload, etc.), since you can access the internal storage, just download a ROM or fill stock ROM zip onto your PC, then just drag/copy to internal storage. Then boot TWRP, select INSTALL, pick the file, and flash it.

What is the background of the device, how do you not know the OS version? Did you receive it this way, or fixing it for a friend or something?

---------- Post added at 09:19 AM ---------- Previous post was at 09:12 AM ----------

When I boot into Fastboot, I get the dm-verity notification "Phone is unlocked and cannot be trusted".

I read that this unlocked-notification appears because I have the wrong kernel? Is that true? Which one do I need?

That isn't the dm-verity notification. The dm-verity notification screen is similar, but says "dm-verity is not started in enforcing mode".

What you described is the bootloader unlocked warning screen. The bootloader unlocked warning screen is expected and normal (in fact, unavoidable) if the bootloader is unlocked. And unlocked bootloader is required for TWRP, flashing custom ROMs, etc.

dm-verity warning screen is in fact normal, as well, if you have TWRP installed. That one can be disabled by a couple different methods. But it's only purpose is to notify a "average" user that the system has been modified. For XDA users that are intentionally modifying their phones (TWRP, root, etc.) the warning is pretty meaningless. Under certain conditions, dm-verity will prevent the phone from booting. But TWRP and root in themselves, will normally not do that.

Neither warning means you have the wrong kernel, necessarily. And unless you (or someone else) tried to flash a kernel, there really isn't any reason to believe that.

---------- Post added at 09:29 AM ---------- Previous post was at 09:19 AM ----------

I tried to reflash the original recovery => device did not start in recovery anymore => reflashed twrp

Flashing stock recovery will (by definition) replace TWRP with stock recovery. You probably have recovery, just the stock one (not TWRP) which is fairly useless in your case (can't flash custom ROMs, root, etc.).

I tried to flash the stock ROM => did not work (with this Error 7)

Can't really troubleshoot this, unless you tell us what file exactly (file name) and where you got it from. "Stock ROM" is far too vague, and can literally mean a dozen or more different things.

Also, what version TWRP?

Using a TWRP version which does not support Oreo is one reason for Error 7. Or you may have tried a file intended for the 3, not the 3T. So these details need to be provided, before we can figure out what went wrong.

What do I want: A stable, rooted ROM. It can be the stock ROM, but also a custom, I do not care right now.

You kind of need to decide which of those you want. Otherwise, there are just too many options for us to give.

Yet another option (in addition to those given) would be to flash the full stock OOS zip from here: https://forum.xda-developers.com/oneplus-3t/how-to/official-oxygenos-5-0-1-android-8-0-t3728119
Then before rebooting, flash Magisk to root, and you should be all set. The full zip will put you on a fully stock baseline (including firmware). Which, if you aren't sure if you want stock, beta or custom ROM, is not a bad place to be; you can see what the "stock" condition is, before messing with things like custom ROMs. But again, it's totally subjective and a matter of personal preference, and you really do need to decide for yourself what is best for you (as an individual) at this time.

 

[Immortalis]

You may want to Sideload the latest Firmware too, Open Beta 21 that is. And then Sideload a Nougat ROM. Don't sideload any GAPPs.

Why not just sideload stock ROM which includes the firmware? Make life easier

 

[redpoint73]

Why not just sideload stock ROM which includes the firmware? Make life easier

Yeah, that is a good option, among many. As I mentioned, there are just too many options since the original poster hasn't even decided stock or custom ROM.

 

[thes3usa]

Why not just sideload stock ROM which includes the firmware? Make life easier

Since OP hasn't mentioned whether he wants to use a stock or custom ROM. So I gave him the link for the latest FW, in case he wants to use a recently updated custom ROM without needing to download the whole Stock zip.

 

[elchico92]

Done!

Thanks a lot. The phone is working again.

I have flashed with adb sideload the firmware and the ResurrectionRemix-Rom (Nougat) and then via TWRP the gapps.
So I hope, everthing will be fine now.

answers:
- TWRP-folder: yeah I created one because I thought, maybe to restore will fix anything
- I tried to flash with TWRP a ROM, but it says "Error 7", which means: wrong ROM => but I am sure, it was the right one
- background: it was the phone of a friend of mine => he never heard anything about ROMs etc

The thread can be closed.

 

[redpoint73]

- I tried to flash with TWRP a ROM, but it says "Error 7", which means: wrong ROM => but I am sure, it was the right one

I already offered to troubleshoot this error for your, but you never supplied the requested info. Don't assume it is the "right one" next time, but rather, give exact file names, version numbers, and let us verify. Mistakes happen, and it always is good to have another set of eyes look at the specifics.

---------- Post added at 09:58 AM ---------- Previous post was at 09:56 AM ----------

The thread can be closed.

Threads on xda don't get closed, just because you solved your current issue. Others may have a similar problem, and may want to ask questions, etc.

 

[slykereven]

I'm stuck in Fastboot Mode & TWRP without OS

I everyone,
Like the title say I'm totally stuck, I don't know what to do ....
I've got a OnePlus 3T few years ago, and the first thing i did at the installation was to encrypt the phone with an option of oxygen OS, and after that i unlock the oem and add root access.
But when oneplus release a major update, there was issues with phone encrypted and unlock, for that I never could make an update of the OS, so I did try to install the lastest lineage os recently, and add an "error 7".
After reading a lot of stuff and try a lot of manupilations, i'm now totally stuck with only access to the fastboot, twrp, and the recovery of oneplus.
If someone here could help me, you will be very gratefull because i can't afford to buy a new phone for the moment... thank's

 

[BillGoss]

I everyone,
Like the title say I'm totally stuck, I don't know what to do ....
I've got a OnePlus 3T few years ago, and the first thing i did at the installation was to encrypt the phone with an option of oxygen OS, and after that i unlock the oem and add root access.
But when oneplus release a major update, there was issues with phone encrypted and unlock, for that I never could make an update of the OS, so I did try to install the lastest lineage os recently, and add an "error 7".
After reading a lot of stuff and try a lot of manupilations, i'm now totally stuck with only access to the fastboot, twrp, and the recovery of oneplus.
If someone here could help me, you will be very gratefull because i can't afford to buy a new phone for the moment... thank's

This should get you back to OOS:
In TWRP:
1. Do a factory reset
2. Flash OOS 9.0.6 full rom
3. Flash this modified firmware (to avoid the issue 9.0.6 with encrypted+unlocked) https://github.com/nvertigo/firmwar...3t/oxygenos-9.0.6-bl-km-5.0.8-firmware-3T.zip (see https://forum.xda-developers.com/on...5-0-8-firmware-barrier-t3941164/post79758055)
4. Reboot

This should leave you with a clean install of OOS 9.0.6 and an encrypted phone with the stock recovery (TWRP gets replaced when you boot stock OOS).

From that point you can do what you want.

Sent from my OnePlus 3T using XDA Labs

 

[slykereven]

Resolved

OK, that's a little crazy but it's working, i've got a one plus 3T A3003, but i had to install Stable9.0.3+Firmware+Modem_OnePlus3.zip and not the one for the 3T ..... then install the last lineage os 17, and everything seems to work for now !!!

---------- Post added at 09:13 AM ---------- Previous post was at 09:09 AM ----------

This should get you back to OOS:
In TWRP:
1. Do a factory reset
2. Flash OOS 9.0.6 full rom
3. Flash this modified firmware (to avoid the issue 9.0.6 with encrypted+unlocked) https://github.com/nvertigo/firmwar...3t/oxygenos-9.0.6-bl-km-5.0.8-firmware-3T.zip (see https://forum.xda-developers.com/on...5-0-8-firmware-barrier-t3941164/post79758055)
4. Reboot

This should leave you with a clean install of OOS 9.0.6 and an encrypted phone with the stock recovery (TWRP gets replaced when you boot stock OOS).

From that point you can do what you want.

Sent from my OnePlus 3T using XDA Labs

Hi, thank's for your help, i didn't see your answer before and i have resolved the issue with other method