Originally Posted by tomi001
I'm using cm 10.2. I want to upgrade the new cm 11 nightly but i wan to flash it over without wipe my data. Is that possible ? I want to run my phone after flashing without bugs or i don't want that the phone is laggy.
Thanks in advance
It's recommended to do a factory reset after installing new version of OS. For CM-11 the base version is KitKat (Android 4.4.x).
To make things little easier, I took a backup of all installed apps (/system/app/ and /data/app folder). I didn't use any app for that matter, but just copied them on my internal SD card under Download folder. This folder won't be cleared during factory reset.
Make sure you have CWM based recovery 126.96.36.199 installed. (Initially I was working with older version of recovery (188.8.131.52) and because cause of that CM-11 could not be installed properly.) I have PhilZ's recovery working pretty good on my E980. You can find it here
Hope that helps.