I am trying to upgrade the firmware for Godox V860 11 (Olympus). I have used the Godox site and followed all the instructions carefully, including removing the battery, etc, etc, etc. I have checked against you tube videos to make sure I am doing everything correctly. I am using a brand new data cable. I have even tried using the Flashpoint version of software. But I always get "connection failed" message. I have uninstalled and re-installed the software numerous times. Any thoughts as to what I am doing wrong?