This whole blog post is a copy paste from reddit: https://www.reddit.com/r/printers/comments/jpgpp3/hp_laserjet_pro_m280_m281_printer_series_20200612/?utm_medium=

ALL CREDIT GOES TO TONY707

Since HP scrubbed the software from their site (!@#@) and someone posted a drive link in the HP Form, which TONY707 figure will get taken down... he linked it below and added the steps.

The latest firmware upgrade forces you to use genuine toner.

he didn't type the steps or try them, but he walked someone through them and they worked.

Downgrade steps from HP Support Form: Since HP is the culprit here by updating the firmware to block all users who use after-market toners. He downgraded the firmware driver with this version and it worked. 

HP_LaserJet_Pro_M280_M281_Printer_series_20200612

Steps:

  • on the printer, go into the printer's Setup | Service | LaserJet Update | Manage Updates
    • set Allow Downgrade = yes, Allow Updates = yes
  • download (HP_LaserJet_Pro_M280_M281_Printer_series_20200612) and run
  • Point that to your printer, his took few times since his printer was connected through WIFI.
  • After downgrade 
  • on the printer, go into the printer's Setup | Service | LaserJet Update | Manage Updates
    • set Allow Updates = no (so the firmware doesn't auto-update and break compatibility again)

Copy of File (My mirror) : HP_LaserJet_Pro_M280_M281_Printer_series_20200612

reference: https://www.1ink.com/content/banner/HP-Color-LaserJet-Pro-MFP-M280M281-Firmware-Downgrade.pdf