Thanks for the guide, @stanley08. I just wanted to inform you guys that in some cases, it's not needed to perform all that. I was on Criskelo V5 with chenglu's CWM recovery, and I just flashed V6 straight away with no wipe. No TWRP, no SuperSU zip, and everything is just fine. I'm now on 4.4 with root, and ExtSDCard works without a fix.