how to upgrade from 3.51m33-7 to 3.90m33?

[spidermman]

hi,

my current fat psp is on 3.51m33-7 firmware...and how can i upgrade it to 3.90m33?

can i use just update with the 3.90m33 file?

thanks.

[davewill]

Here is a guide,upgrade to 3.52m33-4 then what ever you want.
http://www.pspmod.com/forums/custom-...m33-guide.html

[spidermman]

so after installing 3.52m33 on my fat psp...then i can go directly to 3.90m33 with the update file? or do i need to go to 3.71m33 then 3.90m33?

is 3.90m33 stable for fat psp?

thanks.

[davewill]

You need 3.52m33-4 To go to 3.90m33& yes it's stable.