"We then installed an actual 440 cartridge and it sort of worked but after about a week it sees what it thinks is the wrong ink and will not go into remote."
Do you mean the 440ml cartridge worked but the ink is wrong?
What is the problem of wrong ink? ink option is different?
When the 440ml cartridges worked, the printer will be ok.
Problem should be caused by permanent chips.
You can try other permanent chips, as it is not expensive.
It is does not matter with firmware.
Amy