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
Waste Ink Pad Counter reset, Make firmware downgrade, Cleaning printhead, Ink charge, Read and write serial number, Read and write USB ID, Read and write HEAD ID, Make EEPROM dump, backup, Paper feed test, Nozzle check, Color check pattern, Initialize (disable) PF deterioration offset...
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