I tried to factory reset mine since I'm not going to use it anymore.
The problem is, I flashed a modded stock ROM, the one that increases internal storage for apps, and when I did the factory reset, CWM recovery asked me something (I forgot sorry), then I chose Yes (disable something something).
After that, it keeps opening CWM recovery and resetting for several minutes, even up until I'm writing this.
Maybe should I re-flash an actual stock ROM? And if I have to, how?
EDIT : Actually I remember that I've done this before, although I don't remember it was as long as this time.
Do a full wipe and use other roms. That modded stock may be corrupted during download or is not compatible.