After the 2008+ firmware, press Menu → * → Menu within 2 seconds. You access diagnostic screens showing page count per tray and fuser temperature cycles.

One exclusive fix in the HP LJ 1320 firmware update version 20080812 (August 2008) corrected a false "jam in tray 1" error. If your printer claims a jam when there is none, you are running factory firmware from 2004. Part 2: Decoding the "Exclusive" Firmware Versions Here is the information most forums get wrong. The HP LJ 1320 has three distinct hardware revisions: HP LJ 1320 (standard) , HP LJ 1320n (network) , and HP LJ 1320tn (tray + network) . The "exclusive" firmware update process differs for each. The Definitive Version List | Model | Latest Firmware | Date | Exclusive Fix | | :--- | :--- | :--- | :--- | | HP LJ 1320 | 20080812 | Aug 2008 | USB polling rate fix | | HP LJ 1320n | 20080910_3 | Sep 2008 | JetDirect IPv6 compatibility | | HP LJ 1320tn | 20080910_3 | Sep 2008 | Tray 2 paper size memory |

Remember: Always verify your hardware revision, use a stable USB connection, and never interrupt the power cycle. If you have successfully completed the update, your HP LJ 1320 will display Ready 00 with a new internal date code. Enjoy another 200,000 pages of flawless printing.

After the update, consider upgrading the RAM (the LJ 1320 accepts a 144-pin SDRAM SODIMM up to 144MB) and installing a third-party duplexer. With the final firmware, the printer becomes a rock-solid device for another decade. The HP LJ 1320 firmware update exclusive is not a myth or a hack. It is a legitimate, performance-enhancing tool that HP buried in its archives. By following this guide, you can breathe new life into an aging printer, eliminate frustrating errors, and maintain compatibility with modern operating systems.