If all the hardware checks pass, you may want to explore alternative methods, such as (if the ECU family allows reading by virtual read) or utilizing a different tool entirely if the K-TAG protocol is unstable for that specific ECU.
Let’s be honest—many independent tuners use non-genuine (clone) KTAG interfaces. The original Alientech KTAG costs thousands. The clones cost $150–$300. hardware configuration not supported ktag