Chip Resetters for inkjet printer cartridges will reset genuine OEM cartridge chips to "new" specification, allowing your printer to recognize the cartridge as new when you refill it.
Chip Resetter for Canon CLI-271 and PGI-270 cartridges
Chip Resetter for Canon CLI-8 and PGI-5 cartridges
Chip Resetter for Epson cartridges - version 5.0
Chip Resetter for Epson cartridges - version 7.0
Chip Resetter for Epson Wide Format Plotters - version 2.0