Nissan uses what is called a CONSULT II for the ECU reprograms and diagnostics, and there are no software upgrades available to adjust the speed sensor readings to compensate for the larger tires. Your only option would be to get another speedo gear. What model fo frontier do you have? VG33 or KA24, M/T or A/T, King cab, crew cab, regular cab etc... Even your VIN number would help me and I could see what gear you need.