Printer keeps restarting and showing 79 service error message even after turn off & on or unplugged

[Duck1se]

Printer just keeps restarting over and over, shows (79 service error Turn off them on). Turned off for long time and turn back on still same thing. Unplugged overnight and plugged back in, same thing. I have the latest drivers and firmware from HP support but can't figure this thing out. Was working fine 2 weeks ago.

[wbradley9204]

The problem is that the most recent firmware is bad, and results in the "Server Error 79" every time the printer tries to connect to the network.

If you connect the printer to the network via ethernet cable, disconnect the cable.  If you connect the printer to the network via Wi-Fi, then a unplug/wait30seconds/plugin hard power cycle should get the printer to its "Ready" menu, at which point you have maybe 15-30 seconds to click the Wi-Fi icon in the upper right corner and turn off Wi-Fi before it tries to connect to the network.  In either case, once you can get the printer to boot cleanly to the "Ready" menu without it trying to connect to the network, then you'll be golden.

From there, firmware downgrade instructions can be found at https://www.reddit.com/r/printers/comments/jpgpp3/hp_laserjet_pro_m280_m281_printer_series_20200612/

I hope this helps -- good luck!