PSP I can't play online!

long time ago i was playing online perfectly but now when i try to connect on my little big planet, it says there is a software update and i don't want to update to sony's firmware or else i will not be able to play halo beta homebrew on my psp anymore. the same error happens with ALL of my other psp games

are you using custom firmware?if you are, then it should allow you to play online.I can play online with my psp 2000. I have 5.50 GEN-D3-2 "Final Build"