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A DIY trick: cover the electrical contacts on the cartridge chip with a small piece of non-conductive tape (except for the main power pins). This is hit-or-miss and can damage your printer.
This means the firmware downgrade tool isn't recognized as older. You may need to find a different, even older version or use a "service firmware" tool designed for service technicians. Important Considerations hp 6950 downgrade firmware
: He held his fingers over the touchscreen in a specific, rhythmic pattern—Home, Back, Home, Home—until the hidden "Support Menu" flickered to life. It was like finding a trapdoor in a suburban house. A DIY trick: cover the electrical contacts on
