"format data" wipes the system partition. What I've always done when selling Samsung devices is to use Odin. In your case, use Odin full wipe MDK tar file. Then reroot it (towelroot should work, the MDL prerelease kernel & motochopper are probably not necessary anymore) and use TiBu to freeze SDM, so the phone doesn't OTA update. The only way you can truly get rid of data anyway is to overwrite the physical storage that previously held that data. Just "wiping" only deletes the hooks that find and unscramble the actual data, thus all of that information is still recoverable until overwritten.
Format Data- Get into recovery, hit wipe tab, hit format data, type in yes and hit enter.
Use Odin to flash MDK full wipe tar file- Here's a guide on how http://forums.androidcentral.com/spr...in-3-07-a.html , use this file http://forums.androidcentral.com/spr...in-3-07-a.html
Root- www.towelroot.com It's the easiest root method I've ever done. Simple apk install. I've never used it on MDK because it wasn't available the last time I had to root this build. Should work though. If it doesn't follow this http://forum.xda-developers.com/show....php?t=2290798
Use TiBu to freeze SDM- Titanium Backup is an app in the play store... Use this guide http://www.google.com/url?sa=t&rct=j...72197243,d.aWw
Now that you understand how to do it, look for SDM and freeze it. It will stop the phone from trying to take an OTA update.
If you want to get a custom recovery back on there, use flashify (app in play store) to flash the latest TWRP image.
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