Non HP Chip Detected. How to Downgrade your HP 7740 Printer firmware through usb with the .ful file

This post is the follow up to my downgrading HP Officejet 7740 video. It shows you how to download the .ful file to put onto your flash drive so that you can downgrade the firmware to allow you to use third party cartridges. Go to this new link to get to the .ful folder, the mega link has be flagged and deleted. NOTE this is just an alternative option to those who cant get to downgrade their machine via the PC. I cannot guarantee this will work for everyone, also some printers do not have usb ports to be able to use this solution.