I have a sprint galaxy s4 (sph-l720) that I bought which was already flashed to boost with someone else's number. It had jellybean on it so I updated it to Kitkat 4.4.2. This of course wiped out the flash and made the phone new again ready for sprint. I want to flash it back to boost with my roommates boost account. Is this possible to flash a sprint s4 with kitkat 4.4.2 to boost mobile?