How to downgrade HP Printer firmware via FTP

Look, I have no idea if this will work for everyone, but in case someone else is stumbling around trying to find a simple method to fix this problem — which exists solely because HP is greedy — here is what I found to be quick, simple and easy. The instructions will be for the HP LaserJet Pro MFP M281fdw, but I will try to include some information that may help owners of other HP printer models.

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