Refresher

OK guys someone get me up to speed here please :)

I have a couple of PSPs running 5.5 DGEN 3 (I think it is). They work fine for the most part but I wonder what I should actually be running on them now? Both are original PSP Fats.

I have a couple of new retail came that I can't play as they require a later Firmware so how do I get around this? Is there a way to run multiple Firmwares and switch them out?

Thanks guys.
 
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