youre a total lazy guy hmm? instead of googling and use the logical area in the brain you ask us
well you need a hardware flasher and FSM dongle to get back to OFW 3.55
now go in the kitchen and do the cinnamon challenge twice for updating to OFW 4.21
and PSS: have fun buying games from now on
If you want it your way... GO TO BURGER KING!