After loading a software font (.SFP) into an HP M506 printer (e.g. E13B for printing checks), it appears in the "HP PCL5e Permanent Soft Fonts" list and is available for use. However, after the printer loses power, the so-called "permanent" font is lost.
How can the font be made available to the printer at startup? Several vendors sell USB drives with fonts that can be installed, but I have been unable to find documentation regarding creating such a drive with an already-licensed font file.
I've attempted the obvious step of simply placing the font file on an unused USB drive and starting the printer with it plugged in to the rear port, but the font was not loaded. This model printer also has available an extra USB module to allow such a drive to be mounted internally, but I have been similarly unable to find any documentation to explain if that USB port functions differently from the rear USB port.