phone encrypted on its own - One (M8) Q&A, Help & Troubleshooting

everytime i turn on my phone a screen pops up saying "your phone is encrypted"
it asks me for a password (lockscreen password) but i never had a lockscreen password, trying diferent passwords and pressing "decrypt" a screen appears with the following:
"decryption unsuccessful.
The password you entered is correct, but unfortunately your data is corrupt. To resume using your phone, you need to perform a factory reset. When you set up your phone after the reset, you'll have an opportunity to restore any data that was backed up to your Google Account."
then there is just a button that says "reset phone" it sends me to this screen regardless of what password i enter. when i press the reset phone botton, it takes me to TWRP recovery to reset my phone, but when i try to wipe any partitions it does nothing. i tried reinstalling the rom and the "phone is encrypted" screen appears again. i tried installing a different rom and same issue. i tried wiping the data partition through adb shell, but nothing. i've tried everything i could find online but the result keeps being the same, it takes forever to boot and then im greeted by the "your phone is encrypted" screen.
anyone knows what i could do?

adorufo said:
everytime i turn on my phone a screen pops up saying "your phone is encrypted"
it asks me for a password (lockscreen password) but i never had a lockscreen password, trying diferent passwords and pressing "decrypt" a screen appears with the following:
"decryption unsuccessful.
The password you entered is correct, but unfortunately your data is corrupt. To resume using your phone, you need to perform a factory reset. When you set up your phone after the reset, you'll have an opportunity to restore any data that was backed up to your Google Account."
then there is just a button that says "reset phone" it sends me to this screen regardless of what password i enter. when i press the reset phone botton, it takes me to TWRP recovery to reset my phone, but when i try to wipe any partitions it does nothing. i tried reinstalling the rom and the "phone is encrypted" screen appears again. i tried installing a different rom and same issue. i tried wiping the data partition through adb shell, but nothing. i've tried everything i could find online but the result keeps being the same, it takes forever to boot and then im greeted by the "your phone is encrypted" screen.
anyone knows what i could do?
Click to expand...
Click to collapse
if the bootloader can ubl , next flash twrp and wipe internal storage ,reboot to system will be done, but hboot locked , cannot ubl and s-off , emmc change 1 way

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I press the send key to start then the application has an error.
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etcetc."
Anyone? p.s. if i need a stock rom its an o2 rom i need.
Did you try the Hard Reset?

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whenever i start my phone it shows " type password to decrypt storage". if i type a random password it says the password is correct but the data is damaged or corrupted need to factoryreset
1 . i tried factory reset it shows the same
2. i tried recovery mode
3. wipedata/factory reset
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Restart Issue "Android is upgrading..." Everytime I reboot my device

The message "Android is upgrading..." always show up every time I reboot the device.
This happens to me too but it's very strange because it seems a pattern lock I had entered persists across factory resets. So now I have to enter both my old pattern and then my new PIN to unlock my phone when I boot up.
The pattern lock comes up after the "android is upgrading" box which also flashes "starting apps" then "finishing boot" and this is after the boot animation. After I enter my pattern, it goes to boot animation again, then loads Oxygen OS 3.2.1. The reason I find this strange is because after the factory reset, I used a pin number at the setup instead of a pattern to lock the phone.
Why is my old pattern still there? I don't like the delay caused by android is upgrading and repeated boot animation.
As a note, I originally used adb sideload to upgrade from 3.1.3 to 3.2.1..
I think I figured it out. First I tried this method: http://www.androidexplained.com/oneplus-3-fix-twrp-restore-unlock-bug/
But that didn't work... I realized that this was a device encryption thing because TWRP was asking for my pattern as well; not my new pin.
So I restarted into bootloader, connected to PC and used fastboot format userdata. This actually wiped out the encryption and now when I turn on the phone it doesn't say "Android is upgrading", "Finishing boot..." Nor does it ask me to enter my pattern. This did of course reset the phone so it looked like a first-run screen where I followed through and set up a PIN. It seems fastboot format userdata is more complete than a TWRP factory reset.
However, at this time it looks like my OnePlus 3 is un-encrypted and I have the option to encrypt it now. See attached screenshots. The question is, what will happen after I encrypt the OP3? Will it have an annoying looped boot animation and a request for my PIN or pattern?
Silly22 said:
This happens to me too but it's very strange because it seems a pattern lock I had entered persists across factory resets. So now I have to enter both my old pattern and then my new PIN to unlock my phone when I boot up.
The pattern lock comes up after the "android is upgrading" box which also flashes "starting apps" then "finishing boot" and this is after the boot animation. After I enter my pattern, it goes to boot animation again, then loads Oxygen OS 3.2.1. The reason I find this strange is because after the factory reset, I used a pin number at the setup instead of a pattern to lock the phone.
Why is my old pattern still there? I don't like the delay caused by android is upgrading and repeated boot animation.
As a note, I originally used adb sideload to upgrade from 3.1.3 to 3.2.1..
Click to expand...
Click to collapse
After you boot up after encryption go in security there should be an option to require pattern to start device, if that's disabled you won't have the double boot animation. As far as "Android is upgrading" on every boot, that usually happens if you add an app to system partition. I have Google dialer and GSam root companion so I get two apps upgrading on boot.
Your pin or password will survive factory reset.
Sent from my 1+3
Stop rebooting the device then lol
Sent from my ONEPLUS A3000 using XDA-Developers mobile app

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It seems to be the same problem described here:
https://productforums.google.com/forum/#!topic/nexus/yMUh6a2SVLs;context-place=forum/nexus
I've tried rebooting, tried booting into recovery and wiping cache to no avail, tried booting into safe mode, hoping to avoid having to do a factory reset.
I can still receive phone calls and can activate the camera by swiping, so phone is running fine, just can't get past the lockscreen.
Thoughts?
So if it is not the boot up screen to unlock the encrypted partition but the Android start screen, go into recovery, delete the password db file and you are done
in TWRP, go to Advanced > File Manager and navigate to /data/system.
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Urgent - S20 bootloop recovery screen - Erase app data?

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