What is the shown in your printer settings?
Downgrading the firmware on your HP OfficeJet 6950 can be a necessary move if a recent update has triggered "Cartridge Problem" errors or blocked your ability to use more affordable third-party ink. HP often uses firmware updates to implement Dynamic Security measures, which can prevent non-HP chips from communicating with the printer. hp 6950 downgrade firmware
Before you downgrade, you must stop the printer from immediately updating itself back to the latest version. What is the shown in your printer settings
Most firmware installers for HP printers are built for Windows environments. Step 2: Disable Automatic Updates Before you downgrade, you must stop the printer
If the power was interrupted, you may need to perform a "Hard Reset." Unplug the power cord from the back of the printer while it is on, wait 60 seconds, and plug it back in directly to a wall outlet.