so i have been doing a lot of research recently and I'm still confused about the process of upgrading from 3.55 OFW to Rebug 4.21 , all the guides are for going from CFW 3.55 but mine is unmodified, some guides mention that i can just upgrade from the XMB directly, while others say that it's better through recovery(even though i'm on OFW) and to make sure to enable QA first . So i don't know what to do ? use XMB ? recovery ? or go to kmeaw 3.55 and set QA then use recovery to go to 4.21? appreciate the help .