Thanks for the detailed explanation. I was one of the people who had the high-cell voltages some time earlier this year (plenty of posts of mine here - Victron Multiplus + Pylontech high voltage alarm - #126 by ebendl).
My one Pylontech was replaced under warranty and I haven’t had the issue since, but my other two were sitting around, possibly waiting to get the same issue. So I’m glad something was done by Victron to try and prevent this!
(and thanks to @JacoDeJongh for the service and consulting during this whole process).
Quick questions: @JacoDeJongh already loaded the new firmware, but do I need to do anything else? E.g. change charging parameters?