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New ROM Encryption bootloop

[unnecessary background information] A while back I decided to encrypt my OnePlus 2 - mostly to compare its performance with my Nexus 6P, which is also (obviously) encrypted. Today I decided I was tired of Oxygen OS and wanted to install CM13 since Grarak had gotten the fingerprint scanner working properly. I went ahead and unlocked the bootloader, installed TWRP 3.0.0.2, and excitedly flashed the shiny new OS (without making a backup, like an idiot)[/]
After booting up into CM13 the system asks me for my encryption key (sure, whatever) and then I get this big screen that says "Decryption Unsuccessful....The password that you entered is correct but unfortunately your data is corrupt" and goes on to say that a factory reset will fix the problem and any lost data can be re-downloaded from the cloud. I said "great!" and hit the "reboot now" button that reboots back into TWRP, runs a short script, and sends me back to where I started (presumably not on purpose).
Now, I tried doing a full wipe of the entire device via TWRP, which sent me into a new panic mode when I couldn't manage to get any files to transfer over when I tried to send them over MTP - I finally went about using the ADB Sideload feature in TWRP to once again install the same (and a different) ROM all of which garnered the same result.
Finally, the point of the story: Is there a way for me to fully remove encryption from the system from within TWRP? If not, am I totally hosed or does someone have another idea? Frankly, I'd be happy to just have a booting phone at this point.
Thanks in advance!!

So following up on my own thread, I found the setting in TWRP that specifically allows you to erase the data partition (something that I thought I had done when I did a standard wipe and/or when I did the advanced wipe and specifically told it to wipe everything) and rebooted and it finally booted happily into Android. I'm not sure if this is a bug in TWRP or a bug in CM's script that is causing issues but something isn't quite right.

device encryption broken?

Hi!
Since last year I used CM14.1 and now decided to upgrade to LOS14.1.
After installing LOS14.1 via TWRP (after wiping data-cache-system) I tried to encrypt the phone, but after rebooting, it came up unencrypted.
Tried another round with clean installs of LOS14.1 and XenonHD7.1, both didn't work.
I already went back to OP original recovery and OxygenOS 3.5.8, even there the phone claims to encrypt, reboots and comes back after a few seconds unencrypted.
Any idea, what to change to get the OP2 encrypted?
Regards,
Hemingway

Take a backup by connecting your phone in twrp to pc. It should show as a mass storage.
Then you need to go to wipe > format data.
This will completely wipe your data. Then copy your rom back to your phone in twrp and flash.
This should fix it.

Stuck with a OP5 with no OS

Hi everyone,
I have been happy with the Marshmellow version the OS since I bought my phone when it came out (Unlocked, Encrypted). I have performed one update since I had the phone. Today, after seeing the latest posts after not being on this site for a year, I decided to make the move to upgrade to OOS 5.1.0!! Why not, nothing else going on this weekend. I upgrade TWRP to 3.2.1-1, I make a full backup, I follow the upgrade instructions... it fails with the continuous spinning balls on reboot. I Do some research... oh, it is "challenging" to upgrade but possible. No big deal, I will just restore my backup and try again at some other time. My backup restore fails Error 255, I try the fixeS I found such as unmounting data... No Luck). Can not restore the data partition. I guess I should have decrypted everything prior to backing up based on what I read later.
I at least backed up my SD card using adb prior to all this, so I decided to just reinstall ANY OS to get my phone running again for tonight. Well I have not had much luck. I downgraded TWRP to 3.2.1-0, I have tried installing:
OnePlus5Oxygen_23_OTA_033_all_1804110400_eb1766 - Originally installed with not errors but phone reboots back into TWRP after a failed 1st reboot. (I do get a "failed to mount /vendor")
lineage-15.1-20180423-nightly-cheeseburger-signed with Gapps (Gapps failed with I think a error 7)
I was messing with the data partition, wiped, formatted, etc. I am sure this is some of the issues. One other thing is that TWRP always boots to the "keep System Read only" I find this strange and had never seen before. I select to allow modification, but it seems like nothing changes on reboot.
At this point I would just like to get a stock OS image on the phone. IS there something I am missing?

https://forum.xda-developers.com/oneplus-5/how-to/guide-mega-unbrick-guide-hard-bricked-t3698370

Sounds good, let me give it a try.

I've been thru this already. Here is the simplest way to get your 1+5 back to work, while having the latest LineageOS installed. It takes a bit of time and patience, but it works:
Using fastboot, reinstall TWRP 3.2.1-1 (or newer, if any)
Wipe all partitions, namely Dalvik/ART cache, Cache, System, Data and Internal storage
Sideload the latest OOS (version 5.10 or later, if any) with Android 8.1. This version will be OK for LineageOS 15.1 and you will no longer have that stupid error 7 when installing LOS 15.1
If OOS boots into recovery and asks for passwords or PIN or schema ... click on the "forgotten" link. OOS Recovery will then remove encryption and wipe out any data that was left.
Reboot phone, and start OOS session. Do not use any security stuff (PIN or schema or whatever) that would encrypt the phone. At least not now - If necessary, you will add it at the end of this whole process.
Once OOS is working, reboot to Bootloader. Since TWRP has been erased with OOS default recovery, you will have to reinstall it.
From TWRP, wipe Dalvik/ART cache, Cache, and Data partitions. This time, do not touch System or Internal storage
Sideload Lineage OS latest version. If you need to use Google Apps (e.g. Open Gapps), sideload it now before rebooting
Reboot (you might have to reboot twice, don't worry about that).
Once booted in LineageOS, do whatever you like - add accounts, root phone, etc.
Enjoy! (you may want to shout "Vive la France!", well ... don't hesitate!)
Sorry for my poor English. If anything here is unclear to you, please let me know.

I Have no idea what happened. I came home to start working on my phone, powered it up, and boom I have Android 8.1. Ok, Whatever...
Now I wonder if I should go for lineage or not.

kuhnto said:
Now I wonder if I should go for lineage or not.
Click to expand...
Click to collapse
It all depends on how important privacy is to you. If you don't care, then stick to the original OnePlus firmware. If you do, then switch to LineageOS.

TWRP corrupted? Won't restore, won't backup, won't wipe.

I bought a new XT1575 a couple of weeks ago. Once I'd read enough to have confidence I followed the instructions to extract that long number to paste into the form on the Motorola web site and ask them to send me a code. They did, I input the code, I got a notice that my bootloader was unlocked. Once that was done I installed TWRP via ABD (I think, whatever the directions said). TWRP worked, I wiped the stock OS, flashed a custom ROM (Lineage 14) and everything worked perfectly.
Today I wanted to backup my existing ROM, wipe the device and install a different custom ROM. I booted into TWRP and I think it completed the backup. When I went to wipe though, it would crash partway through and boot back to the bootloader unlocked screen. If I tried to simply overwrite the existing ROM with the new ROM that would crash and boot to the bootloader unlocked screen too. Now I can't complete a backup either.
As I'm writing this I'm wondering if the micro USB card could be at fault, since that's where I want to back up to and that's where the new ROM is. However, if it was a corrupted card wouldn't the wipe function still work?
Any idea if reflashing TWRP would solve my problem? Any better solutions?

help about /vendor

im having big problems about vendor. for start im giving some info:
device: mi a1 (tissot)
current os: lineage OS 17.1
root: yes
twrp: can install or use just booting .img
i unlocked my device and installed twrp. there is no problem.
i wanted flash lineage OS and i wiped my device. gives error about cannot mount /vendor
i installed treble supported twrp and installed lineage OS. flashed magisk. installed microg...
then i tried flash mapsv1.zip which is recommended for microg. then booom. another /vendor error.
now i can boot device. i can use everything except gps. google maps app cannot found location. yandex maps can found and i can use it until lock screen or going main screen (or another app). then it starts stopping everytime until i clen its data and cache. then again... in chrome when i open google maps and try found my location chrome stops.
i tried to change /vendor/etc/gps.conf. its still same.
what to do now guys? im worrying about if i try re-flash rom it doesnt flash and device bricked. any solution without re-flash rom? what causes to cannot mount /vendor after solved it?

What exactly did you wipe? I think you wiped vendor, or bumped your O.S. from an old firmware. However, wiping system, data and Dalvik was more than enough.
To solve this, the worst thing to do is trying to hook around. Just reflash the latest original firmware and start again.
Keep in mind that you might need to backup your stuff first.
Use adb pull and push commands in case your device is rebooting too much. Check if device works well this time.
Next, open adb access from device and reboot fastboot to reflash your custom recovery, then reboot recovery and wipe just these items. Finally, complete Rom flashing procedure, depending of your needs.

KaaMyA said:
What exactly did you wipe? I think you wiped vendor, or bumped your O.S. from an old firmware. However, wiping system, data and Dalvik was more than enough.
To solve this, the worst thing to do is trying to hook around. Just reflash the latest original firmware and start again.
Keep in mind that you might need to backup your stuff first.
Use adb pull and push commands in case your device is rebooting too much. Check if device works well this time.
Next, open adb access from device and reboot fastboot to reflash your custom recovery, then reboot recovery and wipe just these items. Finally, complete Rom flashing procedure, depending of your needs.
Click to expand...
Click to collapse
Dalvik cache , system, data, and cache. My device is not rebooting too much. Sory if i couldn't explain. Everything working fine except when an app tries use my location, app stops running, i cant flash anything right now.
İ thought anyone knows mapsv1.zip file(microg.org) and which files are replaced or added by this file when flash it. And can i do it manually? Btw i can read and write /vendor file with solid explorer
İf needed to re-flash rom thats ok but i think lineage OS was perfect for me until this error. And a last thing: can i backup my settings. (İ already took backup of everything in stock when unlocked bl)
Thank you for help
Edit: gps problems started when i tried flash mapsv1

ROM could be perfect, but what I doubt is how perfectly you followed the procedure. Again, better start from zero, being sure you have all the prerequisites (latest firmware included). My humble opinion.

KaaMyA said:
ROM could be perfect, but what I doubt is how perfectly you followed the procedure. Again, better start from zero, being sure you have all the prerequisites (latest firmware included). My humble opinion.
Click to expand...
Click to collapse
Okey ilk try it and share the result night. But is it possible to backup settings of phone?

Well, that's why in step 0 is always recommended to backup you phone. At this level you should have nothing in settings, since you wipe it all... However, that's better, that's the goal of a Clean Install after all. Each ROM has its own flavour and is not recomendable to overwrite these values from a backup, if you're changing ROMs. What you could do, was to backup your apps and some settings with a third app like Swift Backup, or older Titanium Backup, before starting it all, or else, making a complete backup from recovery, in case you end with a problem with newly installed ROM (recommendation here is disable any screen security lock before doing Backups).

KaaMyA said:
Well, that's why in step 0 is always recommended to backup you phone. At this level you should have nothing in settings, since you wipe it all... However, that's better, that's the goal of a Clean Install after all. Each ROM has its own flavour and is not recomendable to overwrite these values from a backup, if you're changing ROMs. What you could do, was to backup your apps and some settings with a third app like Swift Backup, or older Titanium Backup, before starting it all, or else, making a complete backup from recovery, in case you end with a problem with newly installed ROM (recommendation here is disable any screen security lock before doing Backups).
Click to expand...
Click to collapse
İ did it all. Step by step. But i realized something. That errors doesnt matter on my device. Bcs when i flashing stock mi flash tool said failed but i booted system and everything working fine. İ installed persistent twrp. Same error. Then wiped. Same error but wipe completed. Than i flashed this zips single and booted everytime: lineage os, magisk, backup of migrate. Everytime it said cannot mount vendor but all of this apps and os and recovery working fine
Thank you for your helps
[Helping alone ]

Nurullah44 said:
İ did it all. Step by step. But i realized something. That errors doesnt matter on my device. Bcs when i flashing stock mi flash tool said failed but i booted system and everything working fine. İ installed persistent twrp. Same error. Then wiped. Same error but wipe completed. Than i flashed this zips single and booted everytime: lineage os, magisk, backup of migrate. Everytime it said cannot mount vendor but all of this apps and os and recovery working fine
Thank you for your helps
[Helping alone ]
Click to expand...
Click to collapse
if you didn't treblized your device then its not a problem. I have this error too but that's because there is no vendor partition to mount. as been said by unipo:
https://forum.xda-developers.com/mi...-3-3-1-0-tissot-manager-t3976117/post81326153

portox said:
if you didn't treblized your device then its not a problem. I have this error too but that's because there is no vendor partition to mount. as been said by unipo:
https://forum.xda-developers.com/mi...-3-3-1-0-tissot-manager-t3976117/post81326153
Click to expand...
Click to collapse
Are you sure? Bcs i can view and change /vendor in root path. Treblizing is updating and repairing system partitions right? İ am using treble support twrp, flashed stock rom via mi flash(said error but worked fine) then how to treblize a device? And is this required for anything(like a rom, an app)?