THIS IS NOT A JAILBREAK! DON'T ASK!!
Debug PS3 firmwares :First and foremost, this is not about jailbreaking PS3 consoles with firmware 3.56 or higher. Its about the hopes and dreams of finding the exchange keys hidden inside these debug firmwares. Anyways, a guy who goes by the name ConsoleDev has decided to post the download links for official debug firmware v3.50, v3.55, v3.56, v3.60, and v3.65. This is meant for people who own the actual PS3 debug/test unit.
3.60 Download D9D16378DD66AACCA6EF0FC8604F9F67
3.55 Download 3B6EBC594DE5586B5E289225F6D3164A
Thanks at Jailbreakscene.com (Source) for their amazing work at searching for news!
Yes of course, this is not interesting for you. But maybe for someone else!
EDIT: Removed the fake 3.65 debug fw (was OFW)