Question [Q] Restoring Warranty on WIND Mobile Samsung Galaxy S4 SGH-1337M


I have a Samsung Galaxy S4 SGH-1337M with WIND Mobile in Alberta and the screen on it has failed and I need to restore it to a warranty state so that I can get it repaired (since I bought it in September). I recently flashed Cyanogenmod and so I need to find firmware that will allow for OTA update as well as reset the flash counter and remove any recovery.

If anyone could point me in the direction of a. the correct firmware to use and b. any good tutorials on how to go about this I would very much appreciate this.