The update in this case was software. It reduces the charging rate and runs fans during charging to lower the temperature the ICCU has to endure. I bought my car in early 2025 with the update in place and never ran the ICCU at the older, higher temperature. I suspect that a fix like that wouldn’t help anyone who had already baked theirs for months or years.

Did you have the car before the update? Or did you buy it new with the update in place?

It got an update in fall of 2024 that is supposed to fix it. Hasn’t been a problem so far.