In my case it happens on Galaxy s5, it's my new phone, and when I'm exploring security options in settings menu, I active the function "Reativation lock", later when i try to enter in recovery mode to do a integral backup, it shows that message "C...
It's been updated to 1.3 and burst cam doesn't crash.
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Oh my bad with the commands,
As far as the bootloader is concerned i updated it after the first test stuttered so attempt 2 and 3.
And not sure if about the efs, it works 100% perfect after the stock kernel was flashed, but i do have a buckup of...