yashsingh1/xdaforums huggingface dataset:
[Nexus 6P Q&A, Help & Troubleshooting] be_vigilant:
Wow what a mess. I was also stuck in a boot loop when I flashed back from 7.0 to MTC20F. I tried flashing many stock images, all failed and boot looped at the google logo (no loading screen). Like you guys I still had access to TWRP and could flash everything perfectly fine no errors. But bootloop ever time.

I tried the above instructions using a CM13 backup I had , this resulted in the same bootloop. Luckily I found a stock (MTC19T) backup I had from may. Following the instructions and using the combination of the(MTC19T) stock image and a restore from my (MTC19T) backup the phone went past the google logo and went onto an infinite loading screen. Once I reflashed the stock (MTC19T) image the phone booted up. Thanks you so much for the advice! :highfive:
[Nexus 6P Q&A, Help & Troubleshooting] indian84:
If you don't mind, can you share your MTC19T backup? Of course without your data and EFS. It will be nice for me to test.
[Nexus 6P Q&A, Help & Troubleshooting] barturblits:
You can zero the efs partitions within your image so they will be completely empty but you have to be pretty confident you wont leak any personal data from other partitions. Should at least start with a factory reset and make sure all data is completely wiped on your personal partitions on the mmc, fstrim should take care of that during a format.

You can also ask a trusted friend for a backup.
[Nexus 6P Q&A, Help & Troubleshooting] vacaloca:
You should now be able to upgrade to the latest 6.0.1 factory image with no issues. Afterwards, you can even restore the data partition from your MTC19T backup if you wish on top of the latest O/S, and that should work as well. Not sure what it is about restoring a previous backup that makes things work again, but that's also the only way I was able to recover from the bootloops after attempting to go back from 7.0.0 to 6.0.1.

I think what some here haven't tried is restoring /data from a backup -- the backups only had /system, /vendor, etc... maybe restoring /data from a backup is the key. Once my phone boots back up, I'll upload an MTC20F image that also will include a (factory reset) /data partition (only about ~147 MB in size), (no EFS) and see if you guys have luck with that.
[Nexus 6P Q&A, Help & Troubleshooting] joeyddr:
A couple of people have posted backups and they still have not worked... at least for me and someone else on here.
[Nexus 6P Q&A, Help & Troubleshooting] vacaloca:
Here is a Nexus 6P backup done w/ TWRP of MTC20F (excluding EFS) including a factory reset /data partition. I believe the boot image was patched by the superuser installer, but shouldn't matter as it booted fine when I did the factory reset on my end. Afterwards you can flash stock again if the phone boots up successfully.

link to Nexus 6P backup (includes /boot, /cache, /data (after factory reset), /recovery (TWRP 3.0.2-0), /system, /vendor : (link temporarily removed)

Steps to try:

1) Reboot to bootloader and flash stock MTC20F

2) While in bootloader, flash TWRP 3.0.2-0

3) Boot to TWRP 3.0.2-0 from bootloader

4) Select Wipe -> Advanced Wipe -> Select and repair each partition individually (some won't be able to, and that's fine, just move on to the next one)

5) Create backup including /data from TWRP's menu

6) Replace backup files created by TWRP with the ones in dropbox link above via file transfer from recovery

7) Restore backup in TWRP with the files copied from the step above.

8) Reboot phone to system and hopefully it will boot into the Google animation (no more bootloops)

9) If it does not boot past Google animation:

9a) reboot to bootloader and re-flash stock MTC20F

9b) reboot and should boot fine now

Hopefully this works for those that have not been able to get their phones working again.

---------- Post added at 10:06 AM ---------- Previous post was at 10:04 AM ----------

It's possible the backups did not have /data as a partition to restore -- that seems to be the common denominator I have seen from the 3 successes I have seen in this thread (including my own), which is why I decided to post this one w/ a factory reset /data partition in case restoring that will stop the bootloops from happening
[Nexus 6P Q&A, Help & Troubleshooting] indian84:
Hopefully it will work for me. I am downloading files now..
[Nexus 6P Q&A, Help & Troubleshooting] joeyddr:
will give it a go. this is a 20f nandroid?
[Nexus 6P Q&A, Help & Troubleshooting] psychemisha:
Iam waiting for the resoults [MENTION=4570506]indian84[/MENTION]

---------- Post added at 02:25 PM ---------- Previous post was at 02:25 PM ----------

Iam waiting for the resoults [MENTION=4570506]indian84[/MENTION]
[Nexus 6P Q&A, Help & Troubleshooting] joeyddr:
if it works i will try it next.
[Nexus 6P Q&A, Help & Troubleshooting] vacaloca:
Yes, minus modified boot image from a supersu install, but as I mentioned, booted fine for me. Basically I restored /data from a previous backup of the 20F image I had made after I recovered from the bootloops and then I wiped data again, booted once successfully to the setup wizard, and booted to recovery and took the clean /data backup then.
[Nexus 6P Q&A, Help & Troubleshooting] indian84:
Total 18 files you uploaded right??
[Nexus 6P Q&A, Help & Troubleshooting] joeyddr:
no go for me....
[Nexus 6P Q&A, Help & Troubleshooting] indian84:
No go for me too..

:(
[Nexus 6P Q&A, Help & Troubleshooting] hutzdani:
Have you made a full wipe ? any custom bootloader image you had until you get to the point that TWRP says there is no system image installed ?

Too many people are trying to recover backups and not loose their data, you have to keep it simple, screw your pride of getting all your data back, get it over to a PC for safe keeping and get the thing back to a stock image before screwing about with bootloaders / SU / TWRP & Restoring /DATA, your doing too much at once, get back to a clean boot with the original image that shipped with your device !

Reading around the forums people have had issues with the 20f build after installing N, go back to the image that came with your device.

Get the thing to boot with stock everything, drop TWRP because you can always use ADB and fastboot to temp boot it if needs be and dont use a bloody tool kit if you are !

Unless you read the log file when its flashing you can't be sure in what order its flashing your image or what errors it may be pulling do everything logical and manually ! and have it all written down somewhere so you can't possibly screw up.

There is always user error ! I have done many a stupid thing myself but with a proper sequence and starting totally fresh with as little complications you will recover.

I flashed back from N just fine twice, however I do advise ensuring your device is not encrypted !
[Nexus 6P Q&A, Help & Troubleshooting] Jammol:
Did you flash the bootloader and radio?
[Nexus 6P Q&A, Help & Troubleshooting] vacaloca:
Yes.

Sorry it didn't work guys, I'm really at a loss as to why some of us (who had backups) were able to recover and others that did not have backups have not been able to.
[Nexus 6P Q&A, Help & Troubleshooting] akshaysalunke13:
I've upgraded to N via the OTA but I wanna go back to CM13 but I'm too afraid to do that because of all this fiasco and also if I mess my phone I'll be completely out of luck( it'll be a tough one to get it fixed by huawei service centre here in india).

Can someone advise me on whether or not to do it(and how should i do it ).

I really don't wanna mess this phone , coz i won't get a new one and my parents will beat it out of me :p
[Nexus 6P Q&A, Help & Troubleshooting] fhk:
Don't do it!
[Nexus 6P Q&A, Help & Troubleshooting] Trxrad:
Hello guys!

I have the same problem. Sorry for offtopic, but maybe one of you have a TWRP backup for the Nexus 5x? If you have, please could you share the backup.

Thanks!
[Nexus 6P Q&A, Help & Troubleshooting] joeyddr:
have you tried the factory N image on your 5x?
[Nexus 6P Q&A, Help & Troubleshooting] pahlerc1:
I have tried reading every page but I am getting lost as to what is working or what is not working... Is there a way to go about this if I can't access TWRP?? I have tried to fastboot flash 3.0.2-0 and 3.0.2-1?
[Nexus 6P Q&A, Help & Troubleshooting] Trxrad:
Yes, I tried to flash factory image via fastboot / adb sideload (MTC20F) and Android 7.0 (NRD90M), but it does not work. After flash the factory image reboot phone - logo Google - dot animation - bootloop.
[Nexus 6P Q&A, Help & Troubleshooting] :
I ain't TOUCHING my phone until this is resolved. [MENTION=6842057]nathanchance[/MENTION], maybe this deserves a sticky until the problem is figured out.
[Nexus 6P Q&A, Help & Troubleshooting] Koopa777:
Sounds to me like TWRP is the culprit here...

Has anybody been STOCK, taken the OTA (either via sideload or beta program), then flashed the STOCK factory image of ANY 6.X build (no keeping data, TWRP, or other crap like that, pure stock with a wipe) and had any issues?
[Nexus 6P Q&A, Help & Troubleshooting] busbeepbeep:
Here's my story. Stock, locked bootloader. Attempted OTA Friday night. It downloaded, then prompted to install. After some time I checked the phone, it had rebooted, but still in 6.0.1. It said Update failed, please try again. The OTA update came back up and asked me to download again. I decided to worry it about it later cause I needed to use the phone at that time.

On Sunday, phone locked up for 10 seconds while browsing CHrome, then restarted itself. Bootloop, showing the white google logo for 10 seconds, then black screen for 2 seconds, then back to google, infinite looping.

I can access the bootloader screen. From there, choosing any option besides Power Off results in the same bootloop with white google logo. Can't access recovery.

Contacted Google Support, they're sending me a new device. Very bizarre. It's crazy. After the failed OTA, I backed up some things from my device. I was going to research and finally unlock bootloader and root, and then phone crapped out before I had the chance.
[Nexus 6P Q&A, Help & Troubleshooting] mbutandola01:
Have you guys tried flashing the stock preview 5 factory image? I understand it's pretty close to the final version

Envoyé de mon Nexus 6P en utilisant Tapatalk
[Nexus 6P Q&A, Help & Troubleshooting] pahlerc1:
damn this is a good idea. any way someone still has a copy of the DP5.. might be able to fastboot flash that?
[Nexus 6P Q&A, Help & Troubleshooting] BakedTator:
It don't work...already tried...got my new phone today and updated to nougat and leaving it alone...no going back now...lol
[Nexus 6P Q&A, Help & Troubleshooting] vacaloca:
That's the image I updated my phone to initially (without realizing it was not the final one) I attempted root which failed on the google animation, so at that point I flashed the original 6.0.1 backup with TWRP 3.0.2-1 and that's where the bootloops started. Just my 2 cents...

Like the few others on this thread, I got it working again by flashing the stock image of the backup I had, flashing TWRP 3.0.2-0, repairing the partitions, restoring the original backup, and then when past the bootloop of google <-> unlocked bl (got to google animation) then I flashed the stock version on top of the backup (erasing data) and that finally worked. I'm not sure why others cannot get this to work :/
[Nexus 6P Q&A, Help & Troubleshooting] Funkwheat:
As the OP of this thread, just thought I'd update and say I DID in fact manage to fix mine using the method that most have had success with. i.e. restoring factory image -> flashing old twrp -> fixing all the partitions in advance data wipe -> restoring backup. Initially my backup began to load but wouldn't fully boot, but after that I just restored the factory image again and everything has been fine since. Thanks to everyone for the help.
[Nexus 6P Q&A, Help & Troubleshooting] joeyddr:
Mine is on its way back to huwei.
[Nexus 6P Q&A, Help & Troubleshooting] Funkwheat:
Mine will be too when I get the replacement tomorrow, lol. They had already RMA'd it before I managed to fix it, soo...at this point I may as well keep the brand new one.
[Nexus 6P Q&A, Help & Troubleshooting] mbutandola01:
Means that even when Google release the factory image, flashing it is unlikely to fix the issue. I just hope that it's not because something's broken in the final version and that updating to the next version won't screw up our phones. One thing for sure I won't flash the next factory image until I'm sure that it won't mess up my phone

Envoyé de mon Nexus 6P en utilisant Tapatalk
[Nexus 6P Q&A, Help & Troubleshooting] pahlerc1:
i can't get into the rom or into recovery.. whether it is stock or either twrp 3.0.2-0 or 3.0.2-1.

I have even tried to flash the factory images and then boot into TWRP or stock recovery and still cant get it to boot.

UPDATE: I was able to fastboot flash old TWRP, then booted to TWRP but couldn't wipe or anything because it said it couldn't mount data so I went back to bootloader and fastboot format userdata then tried to boot back to twrp and didn't work anymore.. weird

---------- Post added at 05:02 PM ---------- Previous post was at 05:01 PM ----------

i have to send mine back to Huawei too.. but they told me I have to send mine in and then i won't get a phone back for 14 business days.. were you all able to get a replacement and then send in your phone? they are really pissing me off telling me i will be without a phone for 14 business days
[Nexus 6P Q&A, Help & Troubleshooting] tr4nqui1i7y:
You can buy a whole device for close to that much. I just got a 32gb rose gold for like 380 on jet.
[Nexus 6P Q&A, Help & Troubleshooting] pahlerc1:
I was finally able to get TWRP booted and tried repairing system.. then went to try to make a backup and boom.. reboot

---------- Post added at 06:10 PM ---------- Previous post was at 06:05 PM ----------

do you have a way to upload DP5 so I can get a DL of it.. would love to give this a try
[Nexus 6P Q&A, Help & Troubleshooting] Juzman:
I found an old PN backup I made (PN_MTC19T-2016-05-19).

Fllashed factory MTC19T

Flashed TWRP 2.8.7.0

Booted TWRP > Wipe > Advanced > Repair Partitons

Restored the MTC19T nandroid

Bootloop

Re-ran sh flash-all.sh for MTC19T

Bootloop

Going to flash MTC20F and relock bootloader and take it into shop.
[Nexus 6P Q&A, Help & Troubleshooting] tr4nqui1i7y:
Can everyone do me a favour and fill this out? I want to try to find the exact issue at hand so we can better fight against it.

FORM:

EMMC -

DRAM -

Manufacture date -

Brief description of where the bootlooping started - Ex. "I was pushing system files via adb, and cmoding them. I ran SELinux fix in TWRP 3.0.2-0. Upon restoring my backup, I got bootloops"

I was able to fix the bootloop with these EXACT steps - OR*

*I have not been able to fix my device*

My device is

eMMC: 32GB Samsung

DRAM: 3072 HYNIX LPDDR4
[Nexus 6P Q&A, Help & Troubleshooting] scoot0073:
Stay on N don't do it
[Nexus 6P Q&A, Help & Troubleshooting] pahlerc1:
Should I do the same and relock the bootloader before I send it into Huawei? Or just send it in as is with the unlock bootloader message? should be getting my email tomorrow with shipping label.
[Nexus 6P Q&A, Help & Troubleshooting] BakedTator:
FORM:

EMMC - 64 GB Samsung

DRAM - 3072 MB Hynix LPDDR4

Manufacture date - 12-28-15

I have tried everything in this thread to fix my phone! Only thing I haven't done is restore my own backup as I don't have one.

I have not been able to fix my device
[Nexus 6P Q&A, Help & Troubleshooting] tr4nqui1i7y:
Thank you, here's a backup you can try HERE it was posted earlier in the thread.
[Nexus 6P Q&A, Help & Troubleshooting] BakedTator:
As far as I can tell, it requires your own backup...my friend sent me one to try and it failed to work.

I'm just screwing with it now until I send it in...Google hooked me up with my email and I got another day or 2 to try and help fix it
[Nexus 6P Q&A, Help & Troubleshooting] tr4nqui1i7y:
I'm thinking it could be samsungs memory. I'm hoping to gather enough info to see if it's any correlation.
[Nexus 6P Q&A, Help & Troubleshooting] rbouza1:
One quick thing , did we all flash OTA in twrp ? Thats what I did . Reading the post said it was ok to flash over custom rom with twrp . Must be ones on n preview that weren't getting bricked . So what's the difference in 6.01 and 7 that's causing this
[Nexus 6P Q&A, Help & Troubleshooting] AmyClaraRose:
no i flashed with stock recovery becuase i updated after flashing factory image before flashing twrp after tried n went tried digitalhigh to check it out then wanted go back to stock that was 7 days ago and everything ive tried hasnt worked even built images from aosp source code for nougat and it didnt work
[Nexus 6P Q&A, Help & Troubleshooting] rbouza1:
I did a bunch of stuff 4 days later I got mine last Friday
[Nexus 6P Q&A, Help & Troubleshooting] Ericarthurc:
Hey my old Nexus 6p that had the problem had 32gb of Samsung memory. The new one they sent me (after I called about the bootloop) had 32gb of Toshiba memory. I have Android 7 on it and haven't tried to roll back (dont want to risk it again.. haha) but maybe there is a reason my new one had Toshiba memory?
[Nexus 6P Q&A, Help & Troubleshooting] Jammol:
Last but not least, never mind.
[Nexus 6P Q&A, Help & Troubleshooting] BakedTator:
I bought mine in February...so I believe it came with mmb29m...I could be wrong though

---------- Post added at 02:42 AM ---------- Previous post was at 02:42 AM ----------

I was thinking this too but not enough evidence to back it...at least yet
[Nexus 6P Q&A, Help & Troubleshooting] Jammol:
Never mind
[Nexus 6P Q&A, Help & Troubleshooting] BakedTator:
I'll give it a try in a minute and report back
[Nexus 6P Q&A, Help & Troubleshooting] tr4nqui1i7y:
You can believe that as firmly as you'd like. I am currently running tests to prove whether or not that is the case. Nearly all newer 6P have switched from Samsung eMMC to Toshiba.

I am not saying that it certainly is the culprit, but I am trying to deduce WHAT the culprit is. If you have evidence that the issue is stemming from other places, please share. I am looking anywhere, and everywhere for a solution for all those effected.

EDIT:

For users interested in trouble-shooting and data analysis, please visit THIS thread. Post #2 also has a full list of all the methods posted in this thread that you can use as a sort of index if you'd like.
[Nexus 6P Q&A, Help & Troubleshooting] :
You have no proof to make this assertion.
[Nexus 6P Q&A, Help & Troubleshooting] tr4nqui1i7y:
Think we found a Samsung rep [MENTION=4703968]AndroidSlave[/MENTION] ;) jk jk
[Nexus 6P Q&A, Help & Troubleshooting] tr4nqui1i7y:
I have reason to believe otherwise. A lot of other threads and websites have users stuck in bootloop from other casues.

Myself included. I've never even touched nougat. As I am working on porting MIUI 8 to our device. Others have been stuck in bootloop when they were on MM and stock, not even rooted.

I don't disagree that moving backwards was a bad idea. To me, it seems as though users that have done this were rectified one way or another. I am more interested in the users that have tried the 20+ methods I've found and are still stuck.

If you look earlier on in this thread, a lot of users have flashed stock firmware before these more obscure methods, of trying to restore other's backups. Hence why they are doing something that seems so counter-intuitive.
[Nexus 6P Q&A, Help & Troubleshooting] maplestrat:
I flashed back to stock MM from PN, then took the OTA for N, so I should have no problem going back to MM? Not a $500 gamble I am willing to take because I don't have enough information that I won't get the bootloop. This issue is not resolved!
[Nexus 6P Q&A, Help & Troubleshooting] Jammol:
Never mind.
[Nexus 6P Q&A, Help & Troubleshooting] tr4nqui1i7y:
A lot of users have done this, with no positive effects.
[Nexus 6P Q&A, Help & Troubleshooting] Funkwheat:
Follow Heisenberg's guide. http://xdaforums.com/nexus-6p/general/guides-how-to-guides-beginners-t3206928

Or wait if you want to be safe, as we obviously don't have a resolution to this yet.
[Nexus 6P Q&A, Help & Troubleshooting] Ericarthurc:
So far nothing is working!! I can still flash and unflash twrp. I can still access twrp aswell to flash things.. But after a reboot the system never will boot past the google screen. It just keeps boot looping back and forth..
[Nexus 6P Q&A, Help & Troubleshooting] Ericarthurc:
So literally tried everything under the sun! Nothing is fixing it!! I am on the phone will google and project fi right now and it looks like I will be getting a replacement phone. So i recommend all out there who are on custom roms be careful updating to nougat right now. Wait for the developers to update there roms to Android 7 and work out the issues with boot loaders, vendor images, etc..
[Nexus 6P Q&A, Help & Troubleshooting] Jammol:
Do they know it's unlocked and all that? Lucky you.

I was going to ask, I know you wiped data, but did you do a full wipe of everything? Honestly though, using the guide all that happens. This is very strange.

To anyone reading this. If you're going to 7.0...please return to FULL STOCK first. Or better yet...FULL STOCK, relock bootloader, and then take OTA if you really want 7.0 right now. Going straight to 7.0 from seems to be causing issues somehow?!
[Nexus 6P Q&A, Help & Troubleshooting] Ericarthurc:
Hey, yeah google knew the phone was unlocked. They actual had me do some trouble shooting to prove my phone was messed up and the phone operator asked me if the phone was ever rooted and if the boot loader was unlocked. He then asked me to lock the bootloader and try booting again; which didn't work and I knew once the locked the bootloader there was no hope to ever restore the phone. But it was covered under my Project Fi warranty and my new phone comes tomorrow! But I agree, most people having this issue are flashing for the pure nexus rom. There seems to be a theme with this issue and a custom rom.

And yeah I did a complete reflash of everything to stock from the factory image: vendor, boot, cache, radio, and system. I did the whole re haul and it just never worked. The thing that trips me out is that this is considered a semi brick because I can still access TWRP just fine.. I can still flash a new recovery or stock one. I an see all the partitions in TWRP and mount them just fine. But the system will never never boot. Its like a semi/hard brick. I really dont see how this could flashing to 7 could cause a hardware malfunction. So it must be all software based. Some one way smarter than me will hopefully figure it out haha
[Nexus 6P Q&A, Help & Troubleshooting] :
Someone may have fixed this fiasco!!!....
[Nexus 6P Q&A, Help & Troubleshooting] rbouza1:
nope mine boots to warning screen back to google and back to warning
[Nexus 6P Q&A, Help & Troubleshooting] Funkwheat:
Maybe we should have a sticky somewhere warning people of this issue? I mean as of right now it looks like we have at least two confirmed unrecoverable bricks as a result of going from 6.0.1 -> 7.0 -> back again. Seems this could cause some major problems, unless someone comes up with an additional suggestion besides reflashing factory images. This seems potentially serious.
[Nexus 6P Q&A, Help & Troubleshooting] Heisenberg:
At least one of those is almost definitely caused by flashing the OTA over a custom ROM though. I hate to say it but I believe it's come down to user error.
[Nexus 6P Q&A, Help & Troubleshooting] akumalol:
I have the same problem. I had never flashed a custom ROM. I was went from Enrolling Beta to flashing the latest MM factory image via fastboot. I am currently downloading the OTA update (some guy got it from reddit) and will try to sideload it using "adb sideload OTA.zip"