I'm currently on 4.1.2 ROM with ClokworkMod Recovery v18.104.22.168 and I'm going to flash 4.2.2. To my understandings, I should install newer version of recovery - TWRP. Will that erase my previous nandroid backups? Will I be able to restore them if anything goes wrong? Is there anything else I should do besides wiping data/cache?
I'm in a similar situation. I'm running 4.1.2 and am considering finally trying out 4.2.2. My main hesitancy has been the reports of poor Bluetooth performance, so I want to make sure I can return to 4.1.2, if need be. The thing that's made going back to 4.1.2 so problematic has been the change in the way the internal "SD card" is partitioned.
So, my plan is to do a full Nandroid backup before the upgrade using my current recovery, which is CWM 22.214.171.124, and then using "adb pull" to copy the full contents of my phone storage to my PC. Then I'll upgrade to the latest version of CWM's recovery and update the phone to Android 4.2.2.
If I decide to revert, I'll then do a full wipe of my phone, including the SD card, to get rid of the 4.2.2 partitioning, restore to stock 4.1.2, copy the saved copy of my SD card memory back to the phone from my PC, re-install CWM 126.96.36.199, and then restore from my Nandroid backup.
I know this process will work because I just had to do all but the OS upgrade before sending my phone to Samsung for a screen replacement under warranty--I had bad horizontal striping. I backed it up as described above and then restored it yesterday and all is well.
Hope that helps!
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