I use two of them, separately and together to network charge, but I always balance and charge, so I don't see this issue. I power up, then connect the main power and then the balance connection. Reverse this then finished, the AB-BA sequence they advise.

Are you saying you turn it on and if there is nothing plugged into the balance adapter, you're getting this error? Do you have a lipo connected to main power when you do this? Mine power up fine with nothing connected, show me the version and then go to where they were when last used.

Mine are both updated to v2.0 firmware.