Scarborough 
Livingston 
Ireland FIRMWARE DOWNGRADE INSTRUCTIONS
If you have Infotone toners in stock that do not register that you received during or before December 22, due to the firmware update, then please simply now click on your model of printer below and follow the install prompts. You may have a windows warning screen with “Don’t run” message appear, in this case click “more info”, now click the “Run anyway” option that appears.
HP Laserjet Pro M304a M404 (Windows 10/11)
HP Laserjet Pro MFP M428 (Windows 10/11)
HP Laserjet Pro M304a M404 (MAC OS)
HP Laserjet Pro MFP M428 (MAC OS)
** Please note: Reverting your printer firmware to an earlier version may affect other functionality. Please see your printer’s support pages for specific details on firmware changes.
The HP Printer Update window will open and your printer serial number should be visible on the display.
Select the checkbox next to the serial number and then click “Update”
If your printer is using a wifi connection, you will need to connect a USB cable to the printer and computer to get your serial number to display. Once you have connected the cable, wait for about 20 seconds and click “Refresh”. This should trigger the serial number to appear in the window and you can then select the checkbox and click “Update”.
Select “OK” after the update is complete. Now you can start printing with your Infotone printer cartridges again!
Please remember to turn off the automatic firmware updates on your printer after this new update is installed.
Turning off these updates will prevent future automatic updates from HP so you can keep printing with Infotone cartridges.