I've been tuning with HPTuners several years and love it...
10 days ago a client with a 2012 Nissan that shows coverage on the HPTuners site came wanting some tuning.
I read everything on here about tuning Nissans.
As the sticky shows, I got the "Validation checksum failed" message. So followed the instructions for "Validation checksum failed. You will be unable to save or flash this file. This isn't a bug in the software, and is perfectly normal." 10 days ago. I sent in all of the info just as this site says I should....and I still have not been helped.
This is quite disappointing.