These smartchips are required to fully "reset" the printer cartridges to "like new specifications". Cartridges have a smartchip that monitors how much toner is left in the cartridge, and gives you warnings when your toner is running low. For a complete and successful refill on these cartridges, the smartchip needs to be replaced.

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I received the ink cartridges SO20189 and SO20191 that I ordered yesterday, today. Many thanks for your prompt service. I have tested out the colour cartridge extensively and it seems very similar to the Epson original. I have also recommended your products to colleagues and will order some paper shortly.
Julio Contozo, Brazil

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