Create a file and call it test.capt it must not end .txt but .capt... Put the following lines of code in it

!R! FRPO D4,05;STAT1;EXIT;


put test.capt on thumb drive and print from thumb drive... That will darken copy quality from the frpo settins to 05 out of 06 and it will print a status page with the new settings...

Make sure and press start after selecting print from thumb drive or you will stand there like a dork thinking nothing worked...

If that doesn't work for you then try using an hp driver... It might give the customer the desired copy quality...