It's not really clear to me what you mean by this question, but I just ordered THIS map for my 2020 IS300h (so, CY15: Gen9 version), and installed it from the setup screen. After some time the update completed without any troubles, and the new card (02-42-50) + software (VE94102A) were installed.
I understand in your case the update crashed and now you've visited the dealer who is waiting for instructions from Lexus, am I correct?