Once the software says "Done," turn the printer off and back on to finish the process. A word of caution:
For a printer that costs roughly $150 new, this is economically insane. This is where the comes to the rescue.
Inside every Epson inkjet printer (including the L210) lies a sponge-like component called the "Waste Ink Pad." During print head cleaning and regular printing, tiny amounts of ink are purged to prevent clogs. This waste ink drips down onto the pad.
This is a cracked, proprietary Epson service utility. It bypasses the printer’s firmware and directly accesses the EEPROM (memory chip) inside the printer to reset the waste ink counter back to zero (0%).