After upgrading firmware through Victronconnect, the Battery current display is wrong. For example 650W of solar power displayed, close to 50A actually coming out of unit but Battery Current display shows only 9A for 3 or 4 minutes, then correctly shows 49A. The Battery current display used to be correct and vary continuously with the actual current out of the unit but now just seems to be (very slowly) randomly updated. How do I revert to previous firmware whilst the bug gets fixed?