I can reflash any 2003+ Nissan /Infiniti now (finally!)
Done years of research and finally got it down. I made a kernel to read / write and can modify every map, disable dtc's and even disable NATS (anti theft) so you can install engine in any other car with no worries.
If you are local to Southern california I offer this as a service bringing the car to me. If you don't live in SoCal, you can mail me ecu and I can flash to your specs and send ecu back. PM me for more info if interested. Works on all SH7055 and SH7058 Nissan ECUS (2003+) This took me many many hours over past couple years but finally got it down.
The system I use cannot be easily made but I can help people if they want to tune their nissans.