upgrading to new ofw??

well i got 3.5 and im getting a new one so i can put themes on my psp, if i get above 3.5 will pandora box and magic stick still work to downgrade and get CFW or do i have to keep it at 3.5?

So far you can downgrade ANY firmware, but it varies whether you get a SLIM or a PHAT PSP to which process you need to downgrade. You can also use an Unpatched Lumines I game to downgrade 3.50.

Of course you can downgrade it.

Technically i dont think they'll ever end up patching a way to prevent pandora seeing as how its the same method that Sony uses to fix the PSP units. So until Sony thinks of a new way to repair bricked units then we shouldnt have much to worry about in the downgrading department.