HP 364, 564, 934/935, and 920 are all the same cartridge. The chips are just different.
Refill Instructions -
Refillable Cartridges

1. Cover the outlet hole with the orange outlet seal that came with the cartridge or with your finger over the outlet port while wearing latex gloves or with some vinyl tape to prevent ink loss during refilling.

2. Remove the yellow vent tab.

3. Pull the rubber plug out that is sealing the filling hole.

4. Attach the needle to the syringe and fill with the correct color ink.

5. Slowly inject the correct color into into the filling hole until the chamber is almost full. Unused ink may be returned to the bottle.

6. Seal the filling hole using the rubber plug you pulled out. This hole must be sealed air tight or all your ink will drip out.

7. Remove the orange outlet seal (or your finger, or the vinyl tape) from the outlet hole.

8. Replace the cartridge and run 1 - 3 cleaning cycles as per printer instructions.
Or print the following pages:
http://www.refillinstructions.com/black.htm for Black
http://www.refillinstructions.com/color.htm for Color 

If you are filling cartridges to use later, leave the orange outlet seal on the cartridge. This will prevent your sponge from drying out.

The chip will show the ink level when you install the cartridge into the printer for the first time.
After the first tank of ink is finished the chip will show empty, but you can continue to use the cartridge as long as there is ink in the cartridge tank.
Be sure there is ink in the cartridge, because if the printer doesn't have any ink going through the printhead when printing, the printer will kill the chip.
A little trick HP added into the printer for your enjoyment.

ALL the cartridges provided MUST be installed in order for the system to work properly.
Your printer may have trouble recognizing the cartridges if they are not all installed together.
(DO NOT mix the refillable cartridges with other cartridges.)

Warning: - Never do a firmware update or a driver update on your printer. If your printer prints good now, it will not print even better after an update. The purpose of a firmware or driver update is to prevent your printer from accepting after market or refillable cartridges.
Printer manufactures don't want you to refill your cartridges, they want you to purchase your cartridges from them. If you use an after market cartridge or a refillable cartridge and then do a firmware or driver update your printer will give you a message that it does not recognize the cartridges and they will not work anymore.


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