When installing compatibles in a printer that uses 29/29XL or 33XL inks you must install a complete set so that the printer does not reject the inks. You only have to do this once - after that, just change them as required.
1. Remove all the cartridges from the printer.
2. Switch off the printer at the power switch and then unplug the printer from the mains for 2 minutes.
3. Make sure the cartridge bay door is shut and then plug the printer back in and switch the printer on.
4. Install a complete set of cartridges making sure you have removed the tapes from the the cartridges.