a guide to running custom firmware on your psp · all models
online update is the easiest but the servers are probably dead. your best bet is updating via memory stick — this wikihow guide covers it.
plug your memory stick into a reader and extract the ARK-4 zip. copy ARK_01234 to /PSP/SAVEDATA/ and copy ARK_Loader to /PSP/GAME/.
eject the memory stick, slot it into your psp, head to the game menu and run ARK Loader. the psp will soft restart — you're now running ark-4.
with ark-4 running temporarily, copy ARK_cIPL to /PSP/GAME/ and run ARK cIPL Flasher. works on all models including psp-3000 — no motherboard check needed.
there's an ISO folder on your memory stick now (create it if missing). drop psp game isos in there and they'll show up in your game menu. enjoy.