2014 WK2 failed tire size calibration

[CaptChrisP1]

Hello! I recently purchas3d a i3 for my 2014 Jeep Grand Cherokee 3.6l and updated the software. I uploaded the 91 octane tune and attempted to change the tire size. I've tried multiple times but it keeps saying it failed. What do I need to do? Thanks!

[mikel]

if you set it to 30", and it says it failed, go back in to the setting and see if it shows 30". if so it actually took and thinks it failed...