Originally Posted by ecrab1
I have flashed ROMs a few times before on a couple different devices, but I have a couple questions.
1. When I try to flash a OnePlus One CM11 Nightly through TWRP, it always says "Failed". Is there some simple thing that I am forgetting to do?
2. Will it erase anything that is currently on my phone by flashing a nightly? (I don't care if I have to re-root, but I don't want it to erase anything)
If you don't wipe your device it will fail on installing the zip. I am using TWRP and it failed no matter what unless I wiped first. You do not have to wipe you "sdcard" but you will lose your apps. I tried doing a data restore through TWRP and no matter what it would just hang on boot after. I ended up doing a backup through titanium backup and then restored after and it brought pretty much everything over including game data.
There might be a way around this in CWM, but I can say with some confidence there is not using TWRP. It's kind of a bad idea not to do a wipe before flashing a different rom anyways.