Specific files for upgrading from 3.60 to 3.65 custom firmware are hosted on TheOfficialFloW's GitHub Firmware Archives (Historical):
Regarding the "psp2updat pup download link," it seems you're referring to a specific file required for updating the PSP system software. The ".pup" file extension is commonly associated with PSP update files. psp2updat pup download link
The PlayStation Portable (PSP) is a popular handheld game console developed and published by Sony Computer Entertainment. Released in 2005, the PSP was designed to be a portable version of the PlayStation 2, allowing users to play games, watch movies, and listen to music on the go. Specific files for upgrading from 3