The printers in this generation did not utilize the smart function chip that tracks ink useage. Instead the useage is estimated by the printer itself. No resetters are required.
The printer will reset itself when the cartridge is reported to be empty by the printer and replaced with either a refilled or new cartridge.
If the cartridge is refilled and replaced prior to the printer reporting an empty condition, the ink level as reported will remain in a low state even when refilled and will not reset itself to full. It will only do so if the cartridge is allowed to become sufficiently empty and then either replaced or refilled.
There is no harm in refilling prior to the empty warning.
For a more detailed discussion of this refer to the technical section.
Ink Level Monitors on Cartridges without Chips