Hey,
I just ordered a xiaomi mi 5s from gearbest and i was reading arround and it seems that it has a vendor rom that can have bloatware and bad translations and it can be bugged, so my question is what is the most efficient way to backup stock gearbest rom including kernel recovery etc? Because if i install a modified rom on my phone it gets voided by gearbest and i lose warranty, so i need to backup stock rom so i can restore all the things like it came if something happens.
Thanks
In order to make a full backup or to install a custom rom you need to unlock the bootloader.
Bootloader unlock = warranty void
Delux9364 said:
In order to make a full backup or to install a custom rom you need to unlock the bootloader.
Bootloader unlock = warranty void
Click to expand...
Click to collapse
but you can relock it back and in the gearbest website it says this "This Android/Windows device is designed to function specifically with the current Android/Windows OS installed on it. Any alterations such as upgrades, modding with custom ROMs, rooting or flashing the Android device with other firmware will automatically void the device's warranty." it doesn't talk anything about bootloader only roms so if i restore stock rom, remove custom recovery and relock bootloader it's all good am i correct?
When your phone arrive, just download the global rom, connect your phone to PC, create the folder named downloaded_rom on sdcard, put the global rom, go to updater app, select to install the rom and it's all done.
You don't even have to unlock BL or anything and you'll have the global stable rom with ota updates available and no bloatware.
Hope it helps.
floydz said:
When your phone arrive, just download the global rom, connect your phone to PC, create the folder named downloaded_rom on sdcard, put the global rom, go to updater app, select to install the rom and it's all done.
You don't even have to unlock BL or anything and you'll have the global stable rom with ota updates available and no bloatware.
Hope it helps.
Click to expand...
Click to collapse
This works with Gearbest phones? because i saw somehere that it's impossible to update from rom on certain vendor roms
primofernando said:
This works with Gearbest phones? because i saw somehere that it's impossible to update from rom on certain vendor roms
Click to expand...
Click to collapse
Yes. It works.
Usually when its a Fake Rom (Shop Rom), worked out great for mine bought from Banggood.
It has been reported however that this does not work if you installed a chinese version.
floydz said:
Yes. It works.
Usually when its a Fake Rom (Shop Rom), worked out great for mine bought from Banggood.
It has been reported however that this does not work if you installed a chinese version.
Click to expand...
Click to collapse
Nice i will try but it does not void warranty? it's not better backup stock rom because in the website it says this "This Android/Windows device is designed to function specifically with the current Android/Windows OS installed on it. Any alterations such as upgrades, modding with custom ROMs, rooting or flashing the Android device with other firmware will automatically void the device's warranty." with upgrades they are saying that the updates can void too?
primofernando said:
Nice i will try but it does not void warranty? it's not better backup stock rom because in the website it says this "This Android/Windows device is designed to function specifically with the current Android/Windows OS installed on it. Any alterations such as upgrades, modding with custom ROMs, rooting or flashing the Android device with other firmware will automatically void the device's warranty." with upgrades they are saying that the updates can void too?
Click to expand...
Click to collapse
I don't see how this would affect warranty given that the rom that came on your phone was a fake, bloat and aware infested rom. Also unlocking BL is given by Xiaomi itself.
But i don't know anything about Chineses legislation on this. You're most likely on your own risk.
Related
Got myself a Redmi Note 5 Global version and want to update MIUI and possibly try a custom ROM. Just came here to make sure i'm not falling for any common mistakes before i do anything especially after reading a lot of folks that have bricked these devices due to Anti Roll-back so thats the last thing i want to do. The device came boxed with MIUI 9.5.6.0(OEIMIFA) and i've just ignored the update notification up to now so i presume i've avoided ARB and i would like to keep it that way.
So just to confirm are these the correct steps.
1. Unlock the bootloader
2. Flash a custom recovery (TWRP or the equivalent)
3. Update MIUI / Flash custom rom package without ARB and flash through TWRP
Is there anything i'm missing or anything i need to specifically avoid other than ARB?
drkdeath5000 said:
Got myself a Redmi Note 5 Global version and want to update MIUI and possibly try a custom ROM. Just came here to make sure i'm not falling for any common mistakes before i do anything especially after reading a lot of folks that have bricked these devices due to Anti Roll-back so thats the last thing i want to do. The device came boxed with MIUI 9.5.6.0(OEIMIFA) and i've just ignored the update notification up to now so i presume i've avoided ARB and i would like to keep it that way.
So just to confirm are these the correct steps.
1. Unlock the bootloader
2. Flash a custom recovery (TWRP or the equivalent)
3. Update MIUI / Flash custom rom package without ARB and flash through TWRP
Is there anything i'm missing or anything i need to specifically avoid other than ARB?
Click to expand...
Click to collapse
Just don't update your firmware (or update it with a ARB-less firmware), that's what will trigger ARB. Most of the customs rom don't contain firmware, only LOS advises you to flash a specific version, but MIUI roms do.
So you either steer away from those and flash fw-less roms, or you just delete the firmware-files folder from the rom and flash it without them.
This is my advice, before flashing anything, open the zip and check for the firmware folder. If it has it, delete it (unless is specified by the dev to flash that along the rom, in that case, just avoid it, there's a plethora of custom roms to choose from).
Ok thanks so i'll just stay clear of any roms containing the firmware folder for now. I do like LOS but if theres any risk associated i'll just give it a miss for now.
I also assume its easy to recover from a bad flash following the no firmware folder rule since theres no real risk associated with flashing just a ROM(no firmware)?
Finally, what about kernels and bootloader updates is there anything specific i need to watch out for there? I only ask because my previous device included a sneaky OTA update which locked the bootloader and i'd obviously like to avoid anything like that here.
Sorry for all the questions i'm just a bit behind on the flashing front, my previous device was a Motorola Razr HD and flashing seems to have changed quite a bit since then.
drkdeath5000 said:
Ok thanks so i'll just stay clear of any roms containing the firmware folder for now. I do like LOS but if theres any risk associated i'll just give it a miss for now.
I also assume its easy to recover from a bad flash following the no firmware folder rule since theres no real risk associated with flashing just a ROM(no firmware)?
Finally, what about kernels and bootloader updates is there anything specific i need to watch out for there? I only ask because my previous device included a sneaky OTA update which locked the bootloader and i'd obviously like to avoid anything like that here.
Sorry for all the questions i'm just a bit behind on the flashing front, my previous device was a Motorola Razr HD and flashing seems to have changed quite a bit since then.
Click to expand...
Click to collapse
No problems, happy to help if I can.
And yes, no risk if you don't flash firmware. Worst case scenario, you'll have to reflash a miui rom with MiFlash, which means losing your data, but imo it's better than bricking the device.
As for kernels and bootloader, you're good to go. Nothing will relock your bootloader (except flashing with MiFlash and selecting that specific option) and a kernel in the worst case will just give you a bootloop. Use backups. ?
And as far as LOS goes, you can flash it without the specified firmware (even tho I'm pretty sure it's an ARB3 firmware) but I guess there might be some small issues.
Good luck with unlocking the bootloader, that thing takes from 720 to 1440 hours, just got my rn5p in a week now i have to wait a month before rooting...
I found my answers after posting this thread, sorry for the clutter. Please ignore, can't find a way to delete. Thanks! (If a mod sees this, please delete thread)
So I am about to order a chinese RoG II Phone, my goal is to ask to leave the chinese rom as I don't want to lose OTA and I would like to see for myself if I can make do with the chinese fonts here and there... but my question is, if I happen to dislike it and flash the WW rom, I understand I lose OTAs, how about if I flash back the CN rom, will the OTA function return to the phone or is it essentially a one-time deal type of thing? As soon as you flash, OTAs on the device are essentially gone forever??
(Edit: I have read in a different thread that the bootloader can be "re-locked" I assume that is bringing back the phone to it's original state and therefore reinstating OTA as the device will appear to have "never" been flashed a different rom? If possible, please confirm)
While I am at it, any Google Play Services APK will do for sideloading? Can I just grab the latest version? Wait... Is sideloading as simple as just grabbing an .apk and installing it like any other app directly from the phone?? Lulz
Thanks!
WhyKlwd said:
I found my answers after posting this thread, sorry for the clutter. Please ignore, can't find a way to delete. Thanks! (If a mod sees this, please delete thread)
So I am about to order a chinese RoG II Phone, my goal is to ask to leave the chinese rom as I don't want to lose OTA and I would like to see for myself if I can make do with the chinese fonts here and there... but my question is, if I happen to dislike it and flash the WW rom, I understand I lose OTAs, how about if I flash back the CN rom, will the OTA function return to the phone or is it essentially a one-time deal type of thing? As soon as you flash, OTAs on the device are essentially gone forever??
(Edit: I have read in a different thread that the bootloader can be "re-locked" I assume that is bringing back the phone to it's original state and therefore reinstating OTA as the device will appear to have "never" been flashed a different rom? If possible, please confirm)
While I am at it, any Google Play Services APK will do for sideloading? Can I just grab the latest version? Wait... Is sideloading as simple as just grabbing an .apk and installing it like any other app directly from the phone?? Lulz
Thanks!
Click to expand...
Click to collapse
Hi, once you flash any raw firmware whether it's WW or CN. You lose OTA and the consequences for now aren't reversible. So if OTA updates are important to you, you better not flash any raw firmware, it's even better to get the global version instead. Regarding locking and unlocking the bootloader, yes you can do it but it doesn't mean you will not lose warranty for now users who have flashed the same raw firmware of the device "CN rom" haven't been able to go back to the default system state, meaning if you took the device to the service center for what ever reason they would be able to detect that you have altered the system and consequently refuse to service the device for free.
Regarding the play store, you only need to get the latest apk file of the play store and simply installing it. That's it after that you can install/update any app you like.
Rashad83 said:
Hi, once you flash any raw firmware whether it's WW or CN. You lose OTA and the consequences for now aren't reversible. So if OTA updates are important to you, you better not flash any raw firmware, it's even better to get the global version instead. Regarding locking and unlocking the bootloader, yes you can do it but it doesn't mean you will not lose warranty for now users who have flashed the same raw firmware of the device "CN rom" haven't been able to go back to the default system state, meaning if you took the device to the service center for what ever reason they would be able to detect that you have altered the system and consequently refuse to service the device for free.
Regarding the play store, you only need to get the latest apk file of the play store and simply installing it. That's it after that you can install/update any app you like.
Click to expand...
Click to collapse
Hi , I had buy a rog phone 2 Tencent game and I have got an WW rom from the buyer so now I will never get an OTA even if I return to CN rom
masl100 said:
Hi , I had buy a rog phone 2 Tencent game and I have got an WW rom from the buyer so now I will never get an OTA even if I return to CN rom
Click to expand...
Click to collapse
https://forum.xda-developers.com/rog-phone-2/how-to/flashing-ww-rom-changing-cn-fingerprint-t3969765
Follow the link and check the vendor file and see if the country is WW instead of CN. Try to change it to WW if it's still CN. If this doesn't work go back to Chinese Raw firmware flash it and change the vendor to CN and see if that works for OTA updates.
WhyKlwd said:
... (If a mod sees this, please delete thread)
...
Click to expand...
Click to collapse
THREAD CLOSED! Please be aware that XDA currently has more than 3.5 million threads i.e. we just see such a message by accident.
The best is to alert the moderators' team via the Report Functionality.
Hi folks,
I searched the forum and did not find a suitable thread that answered my question.
My Moto G5 has a charging problem and I want to give it back for a repair - it still has warranty.
I have read that flashing a custom rom does not necessarily invalidate the warranty, but to ensure that Motorola will repair the phone I would like to flash a stock (nougat) rom.
Is it possible without the risk of losing IMEI or other stuff?
Or do you recommend to send it back to Motorola with the custom rom installed?
Thank you VERY MUCH in advance!!!
Kind regards
Wolf
They will be able to see you have unlocked the bootloader regardless of whether you re-lock it
Just download the latest stock firmware and flash it via fastboot
If your base firmware is already oreo you can skip flashing gpt and bootloader to avoid risking hard brick
Don't downgrade your base firmware eg if it's oreo don't flash nougat (base firmware is stock firmware not custom rom)
I would flash it back to stock rom so at least they can't blame custom rom
Thanks!! I'm not sure, if it was delivered with Android 7 or 8. But I can flash 8 in any case, because its no downgrade?
And a last question: can I flash it also with TWRP? It's installed anyways...
moped2000 said:
Thanks!! I'm not sure, if it was delivered with Android 7 or 8. But I can flash 8 in any case, because its no downgrade?
And a last question: can I flash it also with TWRP? It's installed anyways...
Click to expand...
Click to collapse
Yes flash android 8 - note if it was never updated to android 8 you will also have to flash gpt and bootloader as well the rest of the firmware
You will need to flash the firmware via fastboot
Flashing via twrp is just like flashing a custom rom with no modifications & you will still have twrp installed and not stock recovery & still have a modified system partition etc
Thanks! Android 8 was definitely installed, only possibly not as stock firmware, but only as custom rom.
But I guess it's okay if I just flash all the files to make sure?
Motorola says, I have lost my warranty because I have opened the bootloader. They won't even fix it for money ****.
moped2000 said:
Motorola says, I have lost my warranty because I have opened the bootloader. They won't even fix it for money ****.
Click to expand...
Click to collapse
Depends what country you are in
In America or Europe you can argue and would most likely win in court that if your issue is totally unrelated to the unlocking of the bootloader they must repair it
Eg if the camera doesn't work because of a faulty component they must fix it
However if the camera stop working because you unlocked the bootloader & did some modifications causing it to no longer work then you're not covered
This would be the same for boot issues - If your phone no longer boots and you have unlocked the bootloader they can claim you have done a modification that now stops it booting
The general rule is if you unlock the bootloader than software/firmware booting issues are not covered but hardware faults unrelated to a bootloader unlock are
Again it varies depending on your country but the above is true for USA & the majority of Europe (EU)
I'm trying to update my Redmi Note 8 Pro global from 12.0.8 to 12.5.1 manually since it doesn't find new updates no matter what i do.
I downloaded the ROM and selected it in "Choose update package", it tries to verify the update for a few seconds then just show me the message "Can't verify update. Couldn't verify update package." or "Can't verify update. Can't flash this stable ROM."
I tried to install it via USB flashing it with mi flash tool, still got the same message.
Does anyone know a fix for this, or at least why this is happening? Any help are appreciated.
Unlock bootloader, download the appropriate ROM for your version of smartphone (fastboot version), delete the check from the flash bat and you can flash. First try flashing, see if it boots. If everything is OK, you can try flash and lock.
Fytdyh said:
Unlock bootloader, download the appropriate ROM for your version of smartphone (fastboot version), delete the check from the flash bat and you can flash. First try flashing, see if it boots. If everything is OK, you can try flash and lock.
Click to expand...
Click to collapse
is there any way to do this without unlocking bootloader?
If you are scared of losing the warranty, you wont once you relock the bootloader. Any other way, you ve tried it and it didn't work
Fytdyh said:
If you are scared of losing the warranty, you wont once you relock the bootloader. Any other way, you ve tried it and it didn't work
Click to expand...
Click to collapse
It's not about the warranty, it's about my bank apps that might not work with the bootloader unlocked.
I'm going to do some research on how to unlock and lock the bootloader, as I didn't know it was possible to lock it again. Thank you for your help!
Fytdyh said:
If you are scared of losing the warranty, you wont once you relock the bootloader. Any other way, you ve tried it and it didn't work
Click to expand...
Click to collapse
Hello, i saw ur comment and made this acc.. can u guide me how to unlock mi10t and like explain whole process from A to Z? I dont wanna brink my phone. And also please guide me how to relock it again as well. Thank you. (I dont want to unlock my phone but its been like more than a year that i havent received a single update, not even a security patch).
Swatyoyo said:
Hello, i saw ur comment and made this acc.. can u guide me how to unlock mi10t and like explain whole process from A to Z? I dont wanna brink my phone. And also please guide me how to relock it again as well. Thank you. (I dont want to unlock my phone but its been like more than a year that i havent received a single update, not even a security patch).
Click to expand...
Click to collapse
I fear that you might have misunderstood me. You cannot relock the bootloader while running a modified stock rom/custom rom. You can only relock the bootloader on a stock rom.
Fytdyh said:
I fear that you might have misunderstood me. You cannot relock the bootloader while running a modified stock rom/custom rom. You can only relock the bootloader on a stock rom.
Click to expand...
Click to collapse
What is the process? Like i found the official rom of my mi 10t but idk how to unlock and relock in fact im worried about bricking my phone and if i able to do stuff right im worried i wont get OTA updated about unlocking my phone
Swatyoyo said:
What is the process? Like i found the official rom of my mi 10t but idk how to unlock and relock in fact im worried about bricking my phone and if i able to do stuff right im worried i wont get OTA updated about unlocking my phone
Click to expand...
Click to collapse
Are you running the latest stock version of your rom? Then, if you plan on using a smartphone with a locked bootloader, you already are. With a locked bootloader you won't get unofficial updates.
Fytdyh said:
Are you running the latest stock version of your rom? Then, if you plan on using a smartphone with a locked bootloader, you already are. With a locked bootloader you won't get unofficial updates.
Click to expand...
Click to collapse
The issue is.. im using miui 12 (12.0.11.0) with security patch or January 2021. Xaiomi blocked/stopped the upgrade from android 10 to 11.
Which version of mi10t?
Fytdyh said:
Which version of mi10t?
Click to expand...
Click to collapse
Press on all specs and see model name.
Fytdyh said:
Press on all specs and see model name.
Click to expand...
Click to collapse
M2007J3SY
Follow these guides
1. https://www.guidetoroot.com/unlock-...ets_Unlock_the_bootloader_on_the_Xiaomi_Phone
if it says wait a week, wait a week.
2. download latest fastboot rom available for your phone (your model is Mi 10T Global):
Xiaomi Firmware Updater
The ultimate script that provides firmware packages for Xiaomi devices.
xiaomifirmwareupdater.com
3. download latest miflash and install
Xiaomi Flash Tool - Official Mi Flash Tool
Download the latest and Official Xiaomi Flash Tool from the Official Xiaomi Flash Tool Website.
xiaomiflashtool.com
4. after selecting the rom, first select "clean all" and flash. if it boots and everything works, retry and select "clean all and lock". why ? if you lock the first time and it doesnt boot, you need to take it to service.
Fytdyh said:
Follow these guides
1. https://www.guidetoroot.com/unlock-...ets_Unlock_the_bootloader_on_the_Xiaomi_Phone
if it says wait a week, wait a week.
2. download latest fastboot rom available for your phone (your model is Mi 10T Global):
Xiaomi Firmware Updater
The ultimate script that provides firmware packages for Xiaomi devices.
xiaomifirmwareupdater.com
3. download latest miflash and install
Xiaomi Flash Tool - Official Mi Flash Tool
Download the latest and Official Xiaomi Flash Tool from the Official Xiaomi Flash Tool Website.
xiaomiflashtool.com
4. after selecting the rom, first select "clean all" and flash. if it boots and everything works, retry and select "clean all and lock". why ? if you lock the first time and it doesnt boot, you need to take it to service.
Click to expand...
Click to collapse
Tyvm i will give this one a try
Fytdyh said:
Follow these guides
1. https://www.guidetoroot.com/unlock-...ets_Unlock_the_bootloader_on_the_Xiaomi_Phone
if it says wait a week, wait a week.
2. download latest fastboot rom available for your phone (your model is Mi 10T Global):
Xiaomi Firmware Updater
The ultimate script that provides firmware packages for Xiaomi devices.
xiaomifirmwareupdater.com
3. download latest miflash and install
Xiaomi Flash Tool - Official Mi Flash Tool
Download the latest and Official Xiaomi Flash Tool from the Official Xiaomi Flash Tool Website.
xiaomiflashtool.com
4. after selecting the rom, first select "clean all" and flash. if it boots and everything works, retry and select "clean all and lock". why ? if you lock the first time and it doesnt boot, you need to take it to service.
Click to expand...
Click to collapse
Hi im back again. So im waititng for 1 week for my device to unlock. Soooo as its my first time doing stuff like this.. i was going through A LOT of new stuff and found xiaomi.eu rom r better in performance than global one. So i got 2 questions i hope u dont mind me asking them here.
1. Eu rom is really better than global? (Btw EEA = ea rom on this website:- https://xiaomifirmwareupdater.com/archive/miui/apollo/ ) ??
2. I heard to get eu rom i need something like twrp and adp something.. but can i get ea room from recovery just like global rom (method u mentioned above. Bcz ur method seems SUPER easy than eu rom one).
Swatyoyo said:
Hi im back again. So im waititng for 1 week for my device to unlock. Soooo as its my first time doing stuff like this.. i was going through A LOT of new stuff and found xiaomi.eu rom r better in performance than global one. So i got 2 questions i hope u dont mind me asking them here.
1. Eu rom is really better than global? (Btw EEA = ea rom on this website:- https://xiaomifirmwareupdater.com/archive/miui/apollo/ ) ??
2. I heard to get eu rom i need something like twrp and adp something.. but can i get ea room from recovery just like global rom (method u mentioned above. Bcz ur method seems SUPER easy than eu rom one).
Click to expand...
Click to collapse
The rom from Xiaomi.eu is a custom rom. Xiaomi.eu is a group of enthusiasts who modify the stock Xiaomi rom, adding and removing features. Make no mistake, that's a custom rom. Close the bootloader with that one installed and you hard brick your device. The method I told you is the official one, which makes downgrading and upgrading your phones super easy. Now, if you want to flash a different version of the stock rom to your phone and lock the bootloader afterwards, be careful. There were reports that nothing happened and everything worked, but unfortunately not that many. A different stock rom might have a different cell tower reception, not adjusted to your country. So you might get less reception.
Fytdyh said:
The rom from Xiaomi.eu is a custom rom. Xiaomi.eu is a group of enthusiasts who modify the stock Xiaomi rom, adding and removing features. Make no mistake, that's a custom rom. Close the bootloader with that one installed and you hard brick your device. The method I told you is the official one, which makes downgrading and upgrading your phones super easy. Now, if you want to flash a different version of the stock rom to your phone and lock the bootloader afterwards, be careful. There were reports that nothing happened and everything worked, but unfortunately not that many. A different stock rom might have a different cell tower reception, not adjusted to your country. So you might get less reception.
Click to expand...
Click to collapse
Ah i got it thank you soooooo much for the clarification. I will go for your method because i want to lock my phone again. I will report back after installing everything. Thank you
Fytdyh said:
The rom from Xiaomi.eu is a custom rom. Xiaomi.eu is a group of enthusiasts who modify the stock Xiaomi rom, adding and removing features. Make no mistake, that's a custom rom. Close the bootloader with that one installed and you hard brick your device. The method I told you is the official one, which makes downgrading and upgrading your phones super easy. Now, if you want to flash a different version of the stock rom to your phone and lock the bootloader afterwards, be careful. There were reports that nothing happened and everything worked, but unfortunately not that many. A different stock rom might have a different cell tower reception, not adjusted to your country. So you might get less reception.
Click to expand...
Click to collapse
Hey today my phone unlocks so i will be doing the update. I just wanted to ask that on website:- https://xiaomifirmwareupdater.com/archive/miui/apollo/ there is miui updates (i downloaded a fastboot 5.2g latest one 12.5.10.0) and firmware of 150mbs. So i have to install both firmware and miui rom? Or just stock miui rom? I read somewhere that firmware is for user which come from very old stock rom to latest one. So how to install firmware?
Hi! I have the Indian variant of OnePlus 11. And needless to say, there've been immense amounts of battery drain after updating it to A.08. Thought of deciding to roll back to the out-of-the-box Version (CP 2447 A.07 imo; Correct me if I'm wrong though). tried doing it by separately downloading A.07 and then installing it by going into system updates, but rom verification failed. So I wanted to know whether flashing the old version would void the warranty of the device and also, will rooting void its warranty? Please suggest an alternative if applicable. Thanks!
The phone will not allow downgrade through system update. That is for security and would require a full data wipe of phone. The only way to downgrade is through the msm tool that we don't have now.
Gas_Wallah said:
Hi! I have the Indian variant of OnePlus 11. And needless to say, there've been immense amounts of battery drain after updating it to A.08. Thought of deciding to roll back to the out-of-the-box Version (CP 2447 A.07 imo; Correct me if I'm wrong though). tried doing it by separately downloading A.07 and then installing it by going into system updates, but rom verification failed. So I wanted to know whether flashing the old version would void the warranty of the device and also, will rooting void its warranty? Please suggest an alternative if applicable. Thanks!
Click to expand...
Click to collapse
AFAIK, on OnePlus devices, unlocking bootloader, rooting, rolling back, installing custom ROM/Recovery etc were never an issue for warranty purpose. Unless OnePlus changed their policy recently, you have nothing to worry on that score.
Rolling back may require a special ROM or the MSM Tool for your device (which I think is not available so far).
EDIT: Or as the previous poster said.
TNSMANI said:
AFAIK, on OnePlus devices, unlocking bootloader, rooting, rolling back, installing custom ROM/Recovery etc were never an issue for warranty purpose. Unless OnePlus changed their policy recently, you have nothing to worry on that score.
Rolling back may require a special ROM or the MSM Tool for your device (which I think is not available so far).
EDIT: Or as the previous poster said.
Click to expand...
Click to collapse
Update to a09
And and and an downgrade you can make when your bootloader is unlocked
Than you can flash a older build to.both slots and delete all cow partition (with FBE)