Hi there and welcome
Firmware is the operating system (like windows) used to run the printer.
The latest firmware you can get from my link below
Download and install it and once done, tell me if the printer now accepts the cartridge please.
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Else let me know the results please.