Hello, I purchased 2 total chipless firmware codes for the Epson SC P800. I purchased one first and went through the directions. The process was successful and worked properly. However the second key although seemed to have installed everything without issue does not work. Does this mean that the key is faulty or another issue. Can someone please get back to me. I want to purchase many more I even inquired about bulk pricing however I cannot move forward with a 50% failure rate please help.