Nissan/Infinity: Undefined x7f Negative Response Code

When writing, an X7f undefined x7f negative response code in a Nissan/Infinity vehicle is almost exclusively due to having load on the battery when reading. 

Ensure all accessories and systems in the vehicle shut off and the doors closed. This would include the radio, headlights and any other installed device.  While performing the write it is also advantageous to have the battery on a tender.