Free Trial Key was supported for along time (2010 – 2015), it is not support in 2016.
You can buy full key to fix your printer :
Printer Reset Keys
Reset Waste Ink Pad Counter Only, Can not reset Ink Level, Remember that after you pay the keys and sent via email, have no refund. Either by misuse (user mistakes at the moment of reset). Also remember that some features are dangerous, experimental and without any warranty.
Price: $7.86Price: $8.68
Click on “Add To Cart” and then “Checkout” to complete payment.
You will receive key by email within 2 minutes after payment