Printronix: Check Firmware Version

From the web portal, click the Available Printers menu.

Locate your printer, then click the Settings icon.

Check the value for the Firmware property. 

At the time of writing, these are the latest firmware versionversions:

• T800 is(T820, T830): V1.48E.
• T4000 (T4204): V1.46H
• T6000e (T6304, T6604): V1.42E

To update your printer, follow this guide: Printronix: Update Firmware