Unless you really want to run homebrew, don't downgrade.
But also don't upgrade beyond 3.50. I'd just wait until castlevania comes out, and then see what firmware version, if any, it requires to play.
The upcoming psp redesign is only going to confuse these issues even more and if castlevania is your priority, there is no need to risk that.
But also don't upgrade beyond 3.50. I'd just wait until castlevania comes out, and then see what firmware version, if any, it requires to play.
The upcoming psp redesign is only going to confuse these issues even more and if castlevania is your priority, there is no need to risk that.