how to go to oos 4.0.2 from h2os - OnePlus 3T Questions & Answers

i have a friend who owns a 3T running h2os when he got the phone. bootloader is still locked. and he wants to go to oos 4.0.2 (N) anyone kind enough to give me the proper steps to change the rom?

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OxygenOs 4.0.2 on Chinese One Plus 3t with HydrogenOs

Greetings from the Netherlands,
I have just got a new One Plus 3t from China as a Chinese New year's gift. However, it has HydrogenOs on it, which I can not really benefit from in the Netherlands (Since there are no Google apps on it)
I have read somewhere, that I am able to flash OxygenOs version 4.0.2 on the device, without unlocking the bootloader, a custom recovery and having to root the phone. I read that I should be able to just directly download the OxygenOs zip file from the OnePlus website and I could just copy the zipped file into the phone storage, and boot the phone from the internal storage.
Can someone tell me if this is true? Or should I do something else? Let me know!
Thanks a lot,
Im with that ver of 3t (a3010) shiping with h2os..
Dont need to unlock bootloader ..
Download OxygenOS 402 official
Update trough internal or sideload it.. Don forger to wipe user data before and after...
Greetings from China.
I am Chinese and I bought OP3T with HOS. Unlocked and flashed TWRP and Oxygen 4.0.2 just for Google service.

[Video Guide] OnePlus 3/3T unlock booloader, Root, TWRP, and how to update

Unlocking the Bootloader, Rooting, installing TWRP, or even a simple task of updating the OnePlus 3/3T to the latest Oxygen OS firmware can get a little tricky for beginners.
Here is a video series for all the visual learners. OnePlus is a stunning community and I felt like I should contribute.
I am putting all the official links for the respective files and downloads so not to violate any policies of the forum.
Before you proceed, please visit the OnePlus written tutorials page to know more about what this page is about.
How to update OnePlus 3/3T easily via stock recovery without root?
This procedure requires the full firmware package found on the official OnePlus downloads page -Latest Open Betas.
The latest official Oxygen OS version is 4.1.1 and Open Beta 13. So if you want to update to the latest one, please download the full ROM zip and follow the video guide below.
Downloads:
Oxygen OS 4.1.1 for OnePlus 3 direct link.
Oxygen OS 4.1.1 for OnePlus 3T XDA link.
How to Unlock Bootloader on OnePlus 3/3T any Oxygen OS version?
This is must before you root or install a custom recovery like TWRP. It is highly recommended that you gain enough information about all the terms we are using in this tutorial. Like what is root, TWRP, bootloader, firmware, etc. and most importantly, as yourself why do you need this?
Requirements:
ADB and Fastboot setup on Windows/Mac/Linux
Fastboot command used: fastboot oem unlock
How to Root OnePlus 3/3T on latest Nougat firmware via TWRP?
Must go through the Unlock Bootloader procedure before this. Tested on latest Oxygen OS 4.1.
Requirements:
Latest TWRP for OnePlus 3
Official TWRP for OnePlus 3T
Latest SuperSU - Version used in the tutorial is SuperSU 2.79 SR3
Fastboot command used:
fastboot flash recovery [filename.extension]
How to easily switch between Official and Beta versions via third-party Local upgrade app?
Make sure you only use the latest versions of Oxygen OS running similar Nougat versions. Due to file partition changes in Marshmallow and Nougat, it is not recommended to flash Oxygen OS 3.5.8 from OOS 4.1.
Requirements:
Local Upgrade app
Please request more videos if you need. I will try making videos with better editing. If moderators think of removing any link, please do.
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[OP5][LATEST 9.0.11] Collection of unbrick tools

Disclaimer: By attempting any of the processes listed in this thread you accept full responsibility for your actions. I will not be held responsible if your device stops working, catches fire, or turns into a hipster and claims to have been modified before it was cool.
Hi everyone, as only a few versions of unbrick tool are available here and that they allow to rollback to specific versions of Oxygen OS I decided to search for more and succeeded in that.
I managed to decrypt some of them (the most recent) but also find some that I was unable to crack that I still share here in case someone find a way to get their password.
As the instructions and Qualcomm drivers are already available here and here, I don't feel a need to rewrite them.
You can ask questions here on how to use and issues, however I might not be able to answer immediately.
Here are the files uploaded on AndroidFileHost ordered by Android version:
ANDROID 9:
OOS 9.0.11
OOS 9.0.10
OOS 9.0.9
OOS 9.0.8
OOS 9.0.7
OOS 9.0.5
OOS 9.0.4
OOS 9.0.3
ANDROID 8.1:
OOS 5.1.7
OOS 5.1.5
OOS 5.1.4
OOS 5.1.3
OOS 5.1.2
ANDROID 8.0:
OOS 5.0.4
OOS 5.0.1
Mirror for first and last MSMs per Android version: https://onepluscommunityserver.com/
Happy unbricking
Credits:
@Titokhan for giving advice on how to present thread
@headsh0t95 for suggesting me to request an access to upload files on AndroidFileHost
@AndroidFileHost for the hosting
@djnim and @snowwolf725 for instructions
OnePlus for the device and OS
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Some_Random_Username said:
Reserved
Click to expand...
Click to collapse
from where u got the link.. and what is the link for oos 9.0.3 tool?
So it's basically the same just like this thread https://forum.xda-developers.com/oneplus-5/how-to/guide-unbrick-guide-hard-bricked-t3761706/page10 ?
But instead restoring 5.1.7 the tool will restore to 9.0.3?
melphoi said:
So it's basically the same just like this thread https://forum.xda-developers.com/oneplus-5/how-to/guide-unbrick-guide-hard-bricked-t3761706/page10 ?
But instead restoring 5.1.7 the tool will restore to 9.0.3?
Click to expand...
Click to collapse
Yes I tried it, everything is ok
Added 9.0.4 unbrick tool
Some_Random_Username said:
Added 9.0.4 unbrick tool
Click to expand...
Click to collapse
Nice, thx :highfive:
Some_Random_Username said:
Added 9.0.4 unbrick tool
Click to expand...
Click to collapse
OOC, what app do you use to decrypt? Rather how do you?
Cause the .ops file needs to be extracted.
hi alguin can you help me? why only start my op5 the tool android nougat, then neither oreo nor foot boots on my device when the installation of both comes out in a successful green
Added 9.0.5 unbrick tool
How to build this??I want to build for HydrogenOS users
daxiaamu said:
How to build this??I want to build for HydrogenOS users
Click to expand...
Click to collapse
I don't built it: it's made by OnePlus themselves
Thank you very much for the latest 9.0.5
Some_Random_Username said:
Disclaimer: By attempting any of the processes listed in this thread you accept full responsibility for your actions. I will not be held responsible if your device stops working, catches fire, or turns into a hipster and claims to have been modified before it was cool.
Hi everyone, as only a few versions of unbrick tool are available here and that they allow to rollback to specific versions of Oxygen OS I decided to search for more and succeeded in that.
I managed to decrypt some of them (the most recent) but also find some that I was unable to crack that I still share here in case someone find a way to get their password.
As the instructions and Qualcomm drivers are already available here and here, I don't feel a need to rewrite them.
You can ask questions here on how to use and issues, however I might not be able to answer immediately.
Here are the files uploaded on AndroidFileHost ordered by Android version:
ANDROID 9:
DECRYPTED OOS 9.0.5
DECRYPTED OOS 9.0.4
DECRYPTED OOS 9.0.3
ANDROID 8.1:
DECRYPTED OOS 5.1.7
DECRYPTED OOS 5.1.5
DECRYPTED OOS 5.1.4
DECRYPTED OOS 5.1.3
DECRYPTED OOS 5.1.2
/!\ ENCRYPTED OOS 5.1.1
ANDROID 8.0:
/!\ ENCRYPTED OOS 5.0.2
DECRYPTED OOS 5.0.1
ANDROID 7.1:
/!\ ENCRYPTED OOS 4.5.13
/!\ ENCRYPTED OOS 4.5.8
/!\ ENCRYPTED OOS 4.5.6
/!\ ENCRYPTED OOS 4.5.5
/!\ ENCRYPTED OOS 4.5.1
Happy unbricking
Click to expand...
Click to collapse
Which is the password for Nougat version?
pindonga123 said:
Which is the password for Nougat version?
Click to expand...
Click to collapse
Hi, as I said in original post I don't have password for Nougat versions but still share them in case someone wish to bruteforce them and succeed in that
Added 9.0.7 unbrick tool as well as an older release (5.0.4)
del
Added OOS 9.0.8 unbrick tool
Hello help me
Recently i moved from beta 35 to stable..
Successfully flashed 9.0.8 with msmdownload tool and flash file.
After moving in stable my device is hanging lot and display is blinking and display showing like pixels.
After i flashed with 9.0.5 stable and moved to last beta 35 version still same problem facing.
Device is non rooted and bootloader is relocked
Plz help me..

Downgrade from Pie back to Oreo because of the camera app

Hi,
I've wanted to try a One UI Pie rom, which I did, I like the new user interface, hate the new camera. I put my feedback on One UI as a PS at the end.
I believe one of the ROMs i tried required me to update bootloader to Pie. Is there a way to downgrade to Oreo, so i can install Oreo ROMS? I tried 2 ROMs and i get a boot loop on both.
Thanks,
Daniel
PS: One UI feedback: Used to be able to take either video or picture one click away, now it's 2. You used to be able to bind the Bixby button to Camera+Take picture with BxButtons, and volume keys to video. No longer possible with Pie. You don't know how important that is untill you went to the mountains, and you need some phisical buttons to use with your gloves. And most important, adding the Dual Shot mod is no longer possible, which was taking the same picture or video with both front and back cameras, which is again verry important for me.
dumitrudan608 said:
Hi,
I've wanted to try a One UI Pie rom, which I did, I like the new user interface, hate the new camera. I put my feedback on One UI as a PS at the end.
I believe one of the ROMs i tried required me to update bootloader to Pie. Is there a way to downgrade to Oreo, so i can install Oreo ROMS? I tried 2 ROMs and i get a boot loop on both.
Thanks,
Daniel
PS: One UI feedback: Used to be able to take either video or picture one click away, now it's 2. You used to be able to bind the Bixby button to Camera+Take picture with BxButtons, and volume keys to video. No longer possible with Pie. You don't know how important that is untill you went to the mountains, and you need some phisical buttons to use with your gloves. And most important, adding the Dual Shot mod is no longer possible, which was taking the same picture or video with both front and back cameras, which is again verry important for me.
Click to expand...
Click to collapse
We need to know what your current "Build Number" is on the phone. You also can't downgrade to other bootloaders that are lower then your current one, so if you're on bootloader 5 you need to use the Oreo bootloader 5 version firmware or it will not work.
MrMike2182 said:
We need to know what your current "Build Number" is on the phone. You also can't downgrade to other bootloaders that are lower then your current one, so if you're on bootloader 5 you need to use the Oreo bootloader 5 version firmware or it will not work.
Click to expand...
Click to collapse
Build number
PPR1.180610.011.hadesRom_OneUI_v4.0. Is this what you need?
Are you saying I'm never going to be able to install an Oreo Rom on my device?
dumitrudan608 said:
Build number
PPR1.180610.011.hadesRom_OneUI_v4.0. Is this what you need?
Are you saying I'm never going to be able to install an Oreo Rom on my device?
Click to expand...
Click to collapse
That's not a normal Samsung firmware.. Where are you from? Was that phone rooted or something? Considering that you have a different rom on the phone it looks like it's bootloader unlocked.. I'm assuming you're not from the USA and that your phone is a N950F correct?
dumitrudan608 said:
Build number
PPR1.180610.011.hadesRom_OneUI_v4.0. Is this what you need?
Are you saying I'm never going to be able to install an Oreo Rom on my device?
Click to expand...
Click to collapse
He is asking for the "N950FXXS5CSA2" firmware to see what bootloader you are on. (Bootloader # is the 5th spot from the right. This case the "5" from "5CSA2" IS THE BL. Version)
Usually it's in about phone/software/ baseband if not there it should say in download mode (look for B: # (# could be 1 to 5)) few lines down I think.
If your on bl. Version 5 you can be able to flash any N950FXXS5..... firmware but not lower like N950FXXU4......
MrMike2182 said:
That's not a normal Samsung firmware.. Where are you from? Was that phone rooted or something? Considering that you have a different rom on the phone it looks like it's bootloader unlocked.. I'm assuming you're not from the USA and that your phone is a N950F correct?
Click to expand...
Click to collapse
Hi, yes the bootloader is unlocked, I have a custom ROM, and my device is Rooted.
Baseband version N950FXXU5DSB1. So N950F, bootloader 5 I guess from what @BluePhnx said. Is there a direct connection between Bootloader 5 and android PIE? Or can Oreo ROMs be compatible with this bootloader?
Thank you for helping me clarify!
dumitrudan608 said:
Hi, yes the bootloader is unlocked, I have a custom ROM, and my device is Rooted.
Baseband version N950FXXU5DSB1. So N950F, bootloader 5 I guess from what @BluePhnx said. Is there a direct connection between Bootloader 5 and android PIE? Or can Oreo ROMs be compatible with this bootloader?
Thank you for helping me clarify!
Click to expand...
Click to collapse
The only connection the bootloader plays is when you go from pie to oreo.
For eg. Oreo is N950FXXS5CSA2
Pie is N950FXXS5DSB2
As long as the bootloader is the same "5" you can go back and forth between pie and oreo.
BUT once you go to a, for eg. let say August security patch for pie, firmware with N950FXXU"6"DSB4 (this has bootloader version 6) then you can NOT go back to oreo. Because the bootloader won't downgrade itself, it will only stay at version 6 or go higher to version 7 and so on.
So if you want to go back make sure the bootloader stays at version 5....
dumitrudan608 said:
Hi, yes the bootloader is unlocked, I have a custom ROM, and my device is Rooted.
Baseband version N950FXXU5DSB1. So N950F, bootloader 5 I guess from what @BluePhnx said. Is there a direct connection between Bootloader 5 and android PIE? Or can Oreo ROMs be compatible with this bootloader?
Thank you for helping me clarify!
Click to expand...
Click to collapse
See what @BluePhnx said? That's what I was trying to explain but he explained it better.. If you want to know what bootloader version you're on you do this see N950FXXU5DSB1 what you do is start at the very END and count backwards 5 letters/numbers and you end up on the number 5 like N950FXXU((5))DSB1 that equals bootloader version 5 but if you see something like this N950FXXU((6))DSB1 then it's bootloader 6 and if you were to flash that one you can never go back to bootloader 5 again it only goes forward but @BluePhnx explained it much better!
BluePhnx said:
The only connection the bootloader plays is when you go from pie to oreo.
For eg. Oreo is N950FXXS5CSA2
Pie is N950FXXS5DSB2
As long as the bootloader is the same "5" you can go back and forth between pie and oreo.
BUT once you go to a, for eg. let say August security patch for pie, firmware with N950FXXU"6"DSB4 (this has bootloader version 6) then you can NOT go back to oreo. Because the bootloader won't downgrade itself, it will only stay at version 6 or go higher to version 7 and so on.
So if you want to go back make sure the bootloader stays at version 5....
Click to expand...
Click to collapse
Hi
I am using Note8 and would like to go back to Oreo as there are too many bugs and I can't record calls. Can you please instruct me so I can do that? Details below.
Note8 SM-N950F
One UI version: 1.0
Android Version: 9
Baseband Version: N950FXXU5DSB1
thisman! said:
Hi
I am using Note8 and would like to go back to Oreo as there are too many bugs and I can't record calls. Can you please instruct me so I can do that? Details below.
Note8 SM-N950F
One UI version: 1.0
Android Version: 9
Baseband Version: N950FXXU5DSB1
Click to expand...
Click to collapse
What is your CSC?
Warning I haven't done this yet since I'm staying on pie. So do it on your own risk! I'm just saying what other people done.. Also I would've done it myself too.
Download the last oreo firmware for your CSC. (The one before Pie.)
Download Odin 3.13.1 or the latest version on computer.
Flash Oreo and home-CSC
But if it doesn't work or you get lots of force closures messages then do this steps.
WARNING!!!! this will erase all data off phone so backup FIRST!
Factory reset phone
Flash OREO with CSC file (NOT the home-CSC)
(What I've read people are saying to do the factory reset option for it to work. I haven't tried it myself since I'm staying in pie. That's why I included the first option.)
BluePhnx said:
The only connection the bootloader plays is when you go from pie to oreo.
For eg. Oreo is N950FXXS5CSA2
Pie is N950FXXS5DSB2
As long as the bootloader is the same "5" you can go back and forth between pie and oreo.
BUT once you go to a, for eg. let say August security patch for pie, firmware with N950FXXU"6"DSB4 (this has bootloader version 6) then you can NOT go back to oreo. Because the bootloader won't downgrade itself, it will only stay at version 6 or go higher to version 7 and so on.
So if you want to go back make sure the bootloader stays at version 5....
Click to expand...
Click to collapse
The problem is most custom ROMs don't actually tell you the firmware code or bootloader version. And I only saw 1 ROM that actually told me that it will update the bootloader to PIE (without specifying the actual version). Do you have any pointers on what should I look for when installing a custom ROM to prevent upgrading bootloader (besides when the ROM actually specifies the Bootloader version of firmware code?
dumitrudan608 said:
The problem is most custom ROMs don't actually tell you the firmware code or bootloader version. And I only saw 1 ROM that actually told me that it will update the bootloader to PIE (without specifying the actual version). Do you have any pointers on what should I look for when installing a custom ROM to prevent upgrading bootloader (besides when the ROM actually specifies the Bootloader version of firmware code?
Click to expand...
Click to collapse
The rom should say what firmware it is based on. Like N950FXXU5DBS2. If not you can ask.
Eg. N950FXXU5DBSA2 - the "5" in ....5DBSA2 is the bootloader version.
You'll can check for your bootloader version in download mode.
Here is a screenshot: (not mine just an eg.)
But you should be able to flash back to an oreo bootloader as long as the bootloader version is the same.
Cannot open PIE after OTA upgrade last Friday.
After upgrade with previous release and security patch of 1st of January I checked somewhere last week and there was n upgrade then.
Last Friday I did see a new OTA update from Samsung and installed it, upgrading to PIE.
After restart I get an error with the SIM card slot. I have a dual SIM version in Spain PHE.
I am unable to use phone now.
Everything original. Only did the dual SIM + memory card. Which has been working perfect for me with OREO.
Which version would I need?
Did the official PIE update change the bootloader version as well?
I just need the double SIM and the memory.
Any help would be greatly appreciated.
BluePhnx said:
What is your CSC?
Warning I haven't done this yet since I'm staying on pie. So do it on your own risk! I'm just saying what other people done.. Also I would've done it myself too.
Download the last oreo firmware for your CSC. (The one before Pie.)
Download Odin 3.13.1 or the latest version on computer.
Flash Oreo and home-CSC
But if it doesn't work or you get lots of force closures messages then do this steps.
WARNING!!!! this will erase all data off phone so backup FIRST!
Factory reset phone
Flash OREO with CSC file (NOT the home-CSC)
(What I've read people are saying to do the factory reset option for it to work. I haven't tried it myself since I'm staying in pie. That's why I included the first option.)
Click to expand...
Click to collapse
Thanks!
Not going to try it though lol i might just buy another one and give this to my family who is not bothered.
BluePhnx said:
The only connection the bootloader plays is when you go from pie to oreo.
For eg. Oreo is N950FXXS5CSA2
Pie is N950FXXS5DSB2
As long as the bootloader is the same "5" you can go back and forth between pie and oreo.
BUT once you go to a, for eg. let say August security patch for pie, firmware with N950FXXU"6"DSB4 (this has bootloader version 6) then you can NOT go back to oreo. Because the bootloader won't downgrade itself, it will only stay at version 6 or go higher to version 7 and so on.
So if you want to go back make sure the bootloader stays at version 5....
Click to expand...
Click to collapse
Is there a way to upgrade to Pie without chaning the Oreo bootloader so you can downgrade if you absolutely can't stand Pie?
edo101 said:
Is there a way to upgrade to Pie without chaning the Oreo bootloader so you can downgrade if you absolutely can't stand Pie?
Click to expand...
Click to collapse
No there isn't. That I know of.
Pie needs the pie bootloader.
I think the only way is to root your phone and have a dev port the pie firmware to work with the oreo bootloader. If possible!
But you "should" be able to flash the 1rst pie release firmware and then go back to the last oreo firmware with a factory reset. (Not certain though so. )
---------- Post added at 11:43 AM ---------- Previous post was at 11:37 AM ----------
BluePhnx said:
No there isn't. That I know of.
Pie needs the pie bootloader.
I think the only way is to root your phone and have a dev port the pie firmware to work with the oreo bootloader. If possible!
But you "should" be able to flash the 1rst pie release firmware and then go back to the last oreo firmware with a factory reset. (Not certain though so. )
Click to expand...
Click to collapse
1rst pie bootloader?
What about this one: N950U1UEU5DSC1

Los to rui cn x2 pro

So I just flashed Latest LOS. Now I want to go back to Stock RUI. Can anyone give the steps to obtain clean RUI again?

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