PS3 JB2 Reverse Engineering
Dongle is DRM to make sure you have the dongle, the firmware 'special' functionality will not work without it. Contentdisc's contain fself'ed eboot.bin's EBOOT.BIN deatils
Below is a preliminary synopsis from moogie via ps3devwiki.com
JB2's dongle updater pkg, its EBOOT.BIN is just an FSELF (fake signed), the Driver: SF eboot fix is also an FSELF, FSELF's are mean't for debug consoles, easier to fself your game, then to actually sign it, you can patch retail FW to run FSELF's, either through the fw, or you can modify PL3, or even, resign the EBOOT.BIN, its nothing special, from the looks of it, they don't have any keys, just debug EBOOT.BIN's.
You don't need that dongle either, just resign the EBOOT.BIN or patch the FW to run FSELF's, their MFW could have these patches, or maybe, their dongle deliver's the patches. I do not know for sure, maybe their dongle does something else entirely, but I know its an FSELF, and you can make that run, without their dongle.