more information for this software:
HP 2500C Series Postscript Firmware Upgrade. This firmware upgrade is required only for PostScript printing in HP2500C series printer. Comparing with version 3010.106.146, this new version 3010.106.209 provides improvement on color vividness in PostScript printing. This firmware works with HP2500C base firmware V 7.x.x and above. You are required to flash the PostScript firmware through a LPT port from your PC. Please refer to the enclosed README file details. For PostScript printing, ensure that the Postscript Memory Module has been installed into the HP 2500C printer. This Memory Module is pre-installed in the HP 2500CM printer.
It is also applicable for Microsoft Windows 3.1