@NiLuJe: If the 'hotfix' is being deleted on a White PW-3 - -
Then it is too late, he has downgraded and run the JB.
Ah, dtrhino inspired the "If you don't find your Kindle in the model table: STOP"
Part of the directions.
But once the model number thing is answered, could you at least re-pack the 'hotfix' so he can move on to re-installing firmware intended for his device.
Hey - It hasn't blown up (yet) - so let him test the rest of the procedure for us.
He just showed us that a White PW-3 will run the firmware of a Slate PW-3.
The Slate PW-3 problems have all been about how Amazon re-thought some of the file formats during the production run.
Your observation about 'must use reset' has fixed those complaints.