Hello guys. I'm am glad that i found this forum after a long research to unlock my Ps vita. I had purchased a Fat Vita (PCH-1010) and for my surprise it came with FW2.12 installed. But i am really curious to know which version is the best to to upgrade it manually. I want it to run Psone and PSP ROMS, and i saw a lot of peoples saying to install version 3.18, the latest best build available for homebrew and emulation. I know to keep away to the latest one 3.52, but i really don´t want to go to 3.18 and discover that 3.10 was better, since downgrade is not possible. If some person can please, tell me the best FW to upgrade, it will be very helpful and them i will be able to continue the steps to play the games. Thanks a lot guys!!!!!