Until replacement chips or a resetter come to market (Uni-Kit is working on both the chips and the resetter), the Canon PGI-225 and CLI-226 ink cartridges can be refilled and re-used in the printer by following the following steps to get the printer to ignore the used OEM chip.
When your printer gives you an error message that the cartridge is "empty", keep pressing "OK" to the error message that comes up on your screen. By continuing to click "OK", the printer will finally give you a warning screen that warns "An ink tank that was once empty is installed. Printing under this situation may damage the printer". This is a warning message geared to persuade you to buy a new cartridge, but the printer does not know that you have refilled ink into the cartridge (it cannot see the ink, it can only see the chip - which says "empty"). Click "YES" to confirm that you understand the warning and that you want to continue to print anyway. You may be prompted again by a follow up message (and possibly a 3rd follow up message) informing you that you should not be printing with an empty cartridge. You can continue to click "YES" or "OK". This will bring you to a final message that gives you the option to "CANCEL PRINTING" or go "BACK". On this screen, press and hold the paper feed button for 5 seconds (if no paper feed button exists on your printer, you can press the STOP/RESET button for 5 seconds instead).
found on .inktelligent.com