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How to reset hp 678 ink cartridge estimated ink levels 
Make sure the contacts that are located on the cartridge (bottom side) are not broken. 
The contacts are a very important part of the cartridge for use, and will be needed to reset the ink level. Your cartridge may vary from genuine hp 678 cartridges, or 3rd party cartridges or remanufactured cartridges.
This method only works with genuine hp 678 cartridges. When you go to the bottom side of the cartridge, there will be many contact points.