I have a stock m7 that has never been rooted. It keeps restarting and if i load to the bootloader it pops up errors that look like the OTA update may have failed. I'm trying to update with a RUU file, but don't know if it matters which one i use. I know that i have to use the amercian tmobile, but can i just get the newest one or do i have to match versions to what was on my phone?