Why can't I use aftermarket ink in my 7740 printer. The fact that you have rigged these machines to accept nothing but HP ink is about the most low down thing a company has ever done. I will never buy anything that has the name HP on it. (except of course your over priced ink cartridges)
Certain HP printers use cartridges that have security chips or electronic circuitry. Cartridges using a non-HP chip or modified or non-HP circuitry* may not work, and those that work today may not work in the future.
This is a Dynamic security enabled printer. The Firmware Update may prevent supplies with non-HP chips or circuitry from working.
Note: For printers manufactured prior to December 1, 2016 dynamic security will not be enabled by the firmware. Please note that HP cannot guarantee the quality or reliability of non-HP cartridges.
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