Alright, so awhile ago I rooted my KF (1st generation) and installed the TWRP Recovery and KFU. I then changed my ROM to the Cyanogen Mod of an unknown version (I was new) and of course, did not backup anything. After my Cyanogen started acting weird, I decided to wipe EVERYTHING from the KF through TWRP. Now, if I boot normally, I stay at the TWRP booting screen (it says kindle fire and "booting..."). I can also access recovery mode (by pressing the power button) but I have no idea what to do with it. The TWRP Version is v2.5.0.0. I'd like to just go back the stock version of the KF if possible. 
