After numerous times and getting almost no help from my tuner figuring out this issue, I've come here hoping to get some answers.
I purchased a HP Tuners RTD for my 2021 Ford Explorer ST. I synched the RTD unit on the HP Tuners website as per the intructions. I downloaded "RTD Flasher" to my laptop. I then inserted the RTD in the OBD port and connected the USB-C cord into the RTD and connected the other side of my laptop "USB" port. I turn the power to "on" in the vehicle. The power light is green on the UTD. I do not start the vehicle.
When I bring up "RTD Flasher" on the laptop I select "read vehicle". I get an error code saying "Interface not found or not responding". I am connected to WiFi, even tried my mobile hotspot. Nothing. I've even changed out the USB cords. It will not read my vehicle information. Please advise...