How can I unlock the Ink Cartridge Protection lock? Without intention to do so I must have activated the Protection preventing me from installing a non-HP ink cartridge that I have just now placed in the printer. Can't seem to be able to nulify the lock.
One additional consideration - turning off cartridge protection will only affect your printer marking cartridges as protected. If the third party cartridge you have was originally inserted in a printer with cartridge protection enabled then that cartridge will not work in your printer - or any others that are not the original printer. In this case I would suggest contacting your supplier for a non-protected replacement.
Turning off cartridge protection will not affect the printer checking for protected cartridges, it only controls whether new cartridges installed in the printer are marked as protected.