For my second ECM....
Downloaded the latest and greatest. Pulled a fresh tune off the P12 using v8. Opened it up in v7 and changed a few small things. Opened the tune back up in in v8 and simply saved it. Opened it in v8 and downloaded it. It went without issue. Turn the key and nothing. Nothing can communicate with the ECM.
This is BS. Im so pissed. So now what. Drop some more money on another ECM and license.