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- HP Community
- Printers
- Printing Errors or Lights & Stuck Print Jobs
- Laser Jet Pro 400 seen as optical reader and not printer

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09-07-2020 03:41 PM
After I updated my father's PC (also in the ENVY line) I could no longer print to the Laser Jet Pro 400 Color M451dn printer.
I uninstalled and reinstalled drivers, rebooted etc. The device appears as an optical reader.
I decided to narrow down the issue, so I bought my laptop (HP ENVY 15 PC Notebook). It too see the Laser Jet printer as an optical device. (Note: My windows is up-to-date with the 1909 release of Windows 10.)
I found a similar problem listed (optical instead of printer) but the solution included buttons not available on the Laser Jet pro 400.
I would be grateful to a solution that is specific to the Laser Jet 400 color M451dn.
09-07-2020 04:03 PM
Update the firmware and that function should be disabled. The function did not work as expected when released and they disabled it in a future firmware update.
I am a volunteer, offering my knowledge to support fellow users, I do not work for HP nor speak for HP.
09-12-2020 06:09 PM
I tried the idea of updating the firmware.
Note that the printer is attached by a USB cable (not on a network).
When using the method for a printer attached by a USB cable, the download asks what printer to update. Unfortunately, the only printers that it lists are the ones already installed. So I seem to have a circular problem. How do I get the firmware to the printer if the PC doesn't know the printer is connected?
Also note that I tried to update the driver, and it completed the software download until reaching 99% and then finally timed out.