Ensure you are using a USB 2.0 port if possible, as some older clones struggle with USB 3.0/3.1 ports. Driver Signature Error:
Do not download from random "driver download" websites (they often contain malware). The most common working version is (or 2.04.16). Look for filenames like: nexiq usb link 2 clone driver
. If successful, you will see the hardware serial number and firmware version. If the Device Tester asks to "Update Firmware," select Ensure you are using a USB 2