I am also getting error message 7. My details:
My Device: Kindle paperwhite touch (7th gen)
current: 5.8.10
JBed in an older version, when upgraded to 5.8.9, then restarted and accidentally reset.
Lost JB and Dummy *.bin cannot write any log file. Later upgraded to 5.8.10
Now tried both *.bin files but showed error 7.
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