a recent firmware upgrade screwed up my HP Color LaserJet Pro MFP M477fdw.
The print outcome is unpredictable, fonts, colors, lines are changing arbitrarily.
Even the built-in test page does not print correctly, its quality is also changing.
Where can I download older firmware versions to downgrade and undo this unsuccessful upgrade?
Maybe from HP's FTP server (ftp://ftp.hp.com/), but which subdirectory?
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