Is it possible for you to share the firmware you have?I have a tool for swiping firmware, and the sales give me some lods of Cobra. D2F8, HPD5 ect...
About every 10 minutes, I was able to brush a DKR5C-J60SS or DKR5E-J1R2SS into non-HDS firmware.
I have the same discs and I cannot update the firmware.