(adsbygoogle = window.adsbygoogle || []).push({}); my ps3 is on 4.21 can i just install 4.65.2 over that over should i go back to 3.55

thanks in advance

If you're on 4.21 OFW, then no, course you can't!

But, if you're already on CFW4.21 then sure - or you could just spoof to 4.66 and stay on 4.21 :derpina: