Help with 3.03 oe-c

I haven't been following the scene for a while and my PSP has been left at 3.03 oe-c, I've gotten MGS into an EBOOT and I placed it in my games folder, but it crashes after 5-10 seconds, and its the same with Patapon (purchased it, ripped it) I placed that in my ISO all though it is a CSO now. Should I upgrade? If I do whats the best upgrade, any tutorials for 3.03 oe-c to upgrade?
Thanks.

I wish I could help you with the crashing, but sadly, I'm pretty new to the PSP scene

But, this guide right here is the best guide available. I actually used it to upgrade my PSP with 3.03 oe-c firmware to 3.52 m33-4 FW. Good luck

[crait]

Yeah, I'd been away since that same era, and now I'm back.
Basically follow that guide and you'd be up to speed!