Scarborough 
Livingston 
Ireland FIRMWARE DOWNGRADE INSTRUCTIONS
If you have Infotone toners that do not register due to a 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 M453 / M454 (Windows 10/11)
HP LaserJet Pro M478 / M479 (Windows 10/11)
** 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”
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.