When I had the "Ropey" BMS update in mid October 2020 as part of the first years service (together with the comfort update) the battery voltage showed 456v at full charge for a few months before the update took effect, it was January before the voltage reduced to 439v.
I know it's counter intuitive but it definitely happened that way, so you need to charge and discharge it a few times before you'll know which update has been applied.
