Cartridge expiration date.
When buying my All in One, I thought to be smart and bought already some spares of cartridges. Now I receive the message that the cartridge dates are expired (!?). It is a C6280 that should have an override possibility, however that does not work for all cartridges, only for the Yellow, which is strange. Result is that the printer does not function at all. How to override these annoying expiration date messages?