HP QMS 1660 - Manual (Page 201)

Updating
System
Software
6-63 Printer Options
Updating System Software
The system software in your QMS 1660 Print System is stored on
4 MB of flash memory that can be erased and rewritten to “in a flash.”
This allows you to update the system software without opening up the
printer and installing new PROMs. Updated system software allows
you to take advantage of future enhancements to the printer.
Updating the system software is a three-step procedure:
1 Choose the appropriate compressed system software files.
2 Install the system software on your computer.
3 Download the system software to the printer.
The following sections explain these steps in detail.
▲ Caution: Some fonts stored on your printer’s hard disk are copy-
protected. Therefore, when you upgrade the system software
(release 2.0 or later firmware) on your QMS 1660 Print System, these
fonts must be downloaded again for the printer to recognize them.
See your font documentation for downloading instructions.