Find the links below. If you have any questions, let me know.

PSP version 6.60:
https://download.digiex.net/Consoles/...

PSP 6.60 PRO-C2 custom firmware:
https://digiex.net/attachments/660pro...

gpSP (gba emulator):
http://www.mediafire.com/file/2olks9r...