I have the virgin mobile s3, and i installed 12.1 on it, but now that i want to go to factory it bootloops, i havent use the s3 in over a year, i have the OnePlus One and it broke on me so i want to factory unlock virgin mobile (which i have the unlock code) to switch it to straight talk so.. im wondering why it wont let me go back, i havent worked on an s3 in a long time..