Downgrade psp fw 2.82?

[Inferno.]

My uncle's got a PSP 2.81 first thing he did was upgrade to 2.82.
Now he wants it downgraded.
Are there any ways it can be downgraded with 2.82?

[Jizzel]

i think it can be downgraded, but not directly. First upgrade to 3.03 and then downgrade 3.03 to 1.50. But ask some other places before you do anything.
btw the downgrade 3.03 --> 1.50 needs GTA ULES 00182 5280129 on the UMD must be the 2.0 Update then it is the right one.