Encryption data needs to be wiped on its own. Hope you’ve backed up all your info in your PC.
Follow the instructions in the second paragraph of this post:
Ah, I see. Not sure I did that.
Yes I backed it all up in my PC.
My problem right now is that I can’t get back to TWRP, since it only shows me this one same screen saying “encryption unsuccessful”. Do you know how to do it? Press some certain buttons at the same time?
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So a few hours ago I managed to get into TWRP! This by shutting the device off and then first pressing the power button for like one second and then also pressing upper volume button (both at the same time.
Since then I’ve been trying to install LineageOS and wiping internal data (in case that wasn’t done before. Looks like it’s all gone though. Or where do i find encryption data?)
I have the latest version of Lineage OS on my SD-card as a zip file. When i try to install it it either says failed (if i tick the boxes "Zip signature verification " and “Reboot after installation is complete” before flashing) or succesful (when i keep those boxes unticked). In both cases the phone comes back to the “encryption unsuccessful” screen when trying to reboot into system mode.
Also restoring the backup fails, as well as wiping cache and dalvik (i think it’s already wiped though).
Is there some step in this that I’m missing? Do i need to do something before installing LineageOS? Do i need to download something else to install at the same time as LineageOS? Do I need to download a different version of LineageOS?
Any other ideas??
Possibly formatting data like @Roboe suggested?
Wiping doesn’t remove the encryption, formatting does. Well, most of the times.
If in your case it doesn’t work this way, please follow the steps given here from “Destroy the LUKS Header for Filesystem Encryption” on …
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Aha!
But actually now that i checked the wipe option again, i realize “format data” is actually what i clicked in the first place. So that’s the first thing i did before trying to install LineageOS again etc.
Hey!! So this just happened (before i could post this reply)! I formatted the data again once or twice and then my dad came by and clicked “wipe cache/dalvik”. I told him it would just say “failed” and then ask for a reboot, after which it would return to the screen saying encryption unsuccessful, because this is what happened to me several times today. But then suddenly a different thing showed up, there were two boxes already ticked, one saying something like “install TWRP app if not already installed” and i think the other said something like “reboot when done” but i am not sure. My dad clicked “do not install” because i told him i already had the TWRP-app. The LineageOS loading logo came up for quite a long time (a few minutes) and then the phone started into system mode!!! It asked me to choose a language, set my timezone and other things to get started, and now guys, i have lineage working on my phone again!! Hahaha sometimes you just need someone new coming in and pressing a few buttons! (i’m very happy but almost a little irritated it got solved THIS easily all of a sudden, and he didn’t even know what he was doing)
But a BIG BIG THANK YOU <3 to all of you who walked me through this and taught me so much!! I think from here on I will manage on my own, otherwise I’ll come back again (or hand my phone to my dad for 2 seconds haha)
NOTE THE EDIT: My dad did NOT install the TWRP-app when this option came up, as opposed to what i wrote earlier (asked him afterwards what exactly he had clicked).
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Oh and another thing!
Now i’ve installed the pico Open GApps (link for anyone who might need it: https://opengapps.org/ ), and just installed the Foodora app Roadrunner (the one i was having problems with to start with, remember? 
) and it works!! 
THE PROBLEM IS SOLVED! Thank you again for this experience and i wish you all a very good night! 
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How about a free salad for all contributors?..
…just kidding, have a good ride.
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Hahaha will come by your house tomorrow, with a salad in my foodora bag 
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Great! I’m glad you can do yooyour work comfortably now! Have a good ride, 
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Hahaha yeah thanks to all your rob(oe)ust answers! 
Lol it literally took me all these 3 days to come up with that reply
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Hahaha, 
Yeah, quite difficult nickname for puns I have!
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