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Man-in-the-Middle PCB Unlocks HP Ink Cartridges
(hackaday.com)
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this post was submitted on 29 Sep 2024
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That's what I used to be able to do. It was pressing the back and cancel buttons in some combination brought up a hidden menu where you could reset the toner levels. You can still bring the menu up on mine but now it ignores any reset you do.