Hi, I'm running KitKat 4.4.2 (Build KOT49H) and have Wug's Nexus Root Toolkit v1.8.0 installed on my PC. The nexus is stock and un-rooted I feel the Nexus has become a bit sluggish as i have continuously installed and un-installed apps, so I wish to set the Nexus back to it's out of the box settings and root it. I'm happy to keep stock build (i.e. I don't want a custom rom). I see I can do this with Wug's toolkit, but have a few questions: Will setting the Nexus back to factory settings also put me back to original build - JellyBean, or will it stay on KitKat build KOT49H? Can I "downgrade" my build back to original JB? If so, would it be better to do so and then upgrade to KitKat, or just "Factory Reset" to KitKat - if you follow my meaning? I know that I will lose all data on the Nexus - I've backed up photos/files etc, and I'm really not bothered about saved game info on Nexus, but does Google Play keep a record of the apps I've downloaded so I can re-install those I want? Last question (promise!) if it is possible to downgrade to JB and I choose to do so, will the apps work with old builds (are they backwards compatible) - I've had this problem with iTouch, new upgraded apps no longer work on my old 2nd gen!!!! Thanks and apologies for stupid questions!!!