If you are troubleshooting and wish to ensure your system is up to date, follow these standard HP procedures:
Today, the story of the 1320 firmware is one of preservation. Most users are warned to update unless necessary. In some cases, newer firmware updates for various HP models have even been accused of "locking out" compatible third-party toner cartridges. For the 1320, staying on its original, "exclusive" factory firmware is often considered a badge of honor—keeping the machine running exactly as it did in 2004. hp lj 1320 firmware update exclusive