Originally Posted by jerichox
hi!, i have a problem
i tried every single tutorial to upgrade my jb king to 2.7 but when i start the ps3 whith the dongle connected the screen stays in black and the system doesnt start
what can be happening? in the morning i have the 2.51 firmware and i cant play but the 2.7 doesnt work 
please help
PS: Sorry for my english i from chile and english is not my first language
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you need to be using TB 3.55 CFW v2
DOWNLOAD HERE