When installing a new ROM it says to perform a factory reset through CWM, which will remove all apps and data but should keep all your pictures, videos, songs etc.
It doesn't mention to wipe the System partition as well. Is this not necessary when flashing ROMs on a Nexus?
Prior to owning the N4 I had the Galaxy S 2 and it was always stated in the OP instructions to wipe data/factory reset, wipe system, clear cache, clear dalvik and then flash ROM and Gapps.
However, I don't notice in any guides or instructions for N4 ROMS to wipe the system partition, just the data partition. Is there a reason for this or is it not necessary to wipe the system partition? Thanks. Great guide by the way.
Any ROM.zip has a script to wipe system before installing.
I actually have a question along these lines.
I just came from a LG G2X so things were different for me whenever I flashed ROM's/kernels. For one thing, I had an external sd card so whenever CWM made it's backups, they went to that automatically and I didn't have to worry about wiping since everything was on the external. This phone doesn't have an external so where do the backups go? From the looks of the new CWM 220.127.116.11, the backups (and blobs now apparently) go to /data/media/clockworkmod. Well I guess my question here is if you have to wipe /data for installing new ROM's, how would I restore a backup because they would have been deleted off the /data partition. I tried adb pulling /data/media/clockworkmod to my computer but it won't go. Don't know if it's because that partition is mounted while the phone is in use or what. I tried the mount/umount command that OP listed but it won't work for me. Don't want to flash ANYTHING on this phone until I know for a fact I can get to the backups that I'm creating.
The entire /data/ partition is wiped.
With ANY custom recovery.../data/ is wiped but /data/media/ is retained.
Not sure what the issue pulling clockworkmod would be...
I don't actually own this phone...
But try adb pull /data/media/0/clockworkmod /clockworkmod/ to see if that gets it.