I don't know of a spoofer for 4.65, but there is a spoofer on the PS3ita website for 4.60. 4.65 was an optional update, so the 4.60 spoof will be fine.
Just jump over to this link:
You must login or register to view this content.
It's in a different language, but there is an English section on the page. Just download the CFW Setup tool from that page, install the pkg on your PS3 & choose the PS3 4.50 Spoof option, or something like that. xD