B300 BMS version

I have 4 B300s connected to an AC300. One battery has a different BMS version than the others. It when I try to upgrade the firmware it says it has the latest? Any suggestions?

Maybe just connect the batteries with the older versions then try through the app to upgrade?

I see the same issue with my two-battery setup.

Twister, it didn’t work. Thanks.

I just looked at my batteries and they too are different versions…