OMG what a pile of shi-
You have to literally downgrade back to cobra 3.55 from whatever you're running in order to run the firmware updater to update the DONGle to v.6. Because if you just go ahead and install the CFW first, then try to make the dongle work, you'll find that it hangs on boot with the dongle inserted. (mmmm. boots. dongles. inserted. O HAI ROB HALFORD)
Anyway, once you downgrade back to cobra 3.55, run the Cobra Updater to flash the DONGle to v.6, then you can install the new CFW, realize it's a huge PoS, and remember that you have a PS2 that plays all those backups just wonderfully from the network share (not that it matters if you don't have a BC PS3 anyway), and a PSP running 6.60LE, and... so why do I need this crap?
My first reaction was/is to just put rebug back on, then I realized- my DONGle is basically bricked now. I'm almost 100% sure it can't be downgraded back to V.5, so it will never work with their 3.55 CFW again. Oh, did I mention, once it's upgraded to V.6, it hangs booting their 3.55.
Too sleepy now, but my PS3 is going back to rebug 4.30 asap. And I guess the snake dong is going in the trash.