I wanted to update my psp from 5.50 gen d2 to 6.35 pro b in order to play tha newest games....

I have read in the internet that i have to use 6.35 ofw in order to update to 6.35 pro b....

so i downloaded the ofw and tried to install it...

as i mentioned before i have 5.50 gen d2.So,when i tried to update to the 6.35 ofw,my system displayed a message: "Your firmware is 9.90.There is no need to update.

what can i do in order to install 6.35 ofw and then 6.35 pro b????