Terminal command to update firmware on HP 800ps Designjet printer?

The error message is clear, the HP app is not compatible with your version of macOS (also indicated by the white circle with diagonal line through it). If this is an old printer, then HP may no longer provide macOS software support for it.

If your printer has an LCD menu panel, then usually you should be able to update the printer firmware that way.

Does you printer have an web interface for administration? That is another way to update the printer's firmware.

Be very careful updating HP printer firmware especially if you are using third party ink since many HP firmware updates will prevent you from using the printer with third party ink. If it is a multi-purpose printer with scanner, then you also have to be careful that the firmware update doesn't prevent you from scanning if one of the ink cartridges is empty. HP is known for tricks with their firmware updates. Personally I would avoid updating the HP printer firmware unless there is a critical reason to do so, but only after confirming that firmware revision will not negatively impact your printer with the points I just made (don't expect HP to actually tell you in the firmware changes list that they are going to limit your printer).

You should not need to use the command line. Just double-click the disk image which should mount the disk. Run the app inside.

FatherHenry50 wrote:

I am trying to update the firmware on my HP 800ps printer/plotter using: HP_Firmware_Update_Install_A0402.dmg

I tried using the "hdiutil attach" command, but after the checksum it lists three lines about disk partitions and then goes back to the terminal prompt. After rebooting the printer the firmware has not been updated.

Update the firmware on an HP printer

That means it doesn't work on Ventura. Is it supposed to work on Ventura?