I purchased a 2018 model S 100d in September, and have received 1 software update since the purchase (2018.34.1). My co-workers have a model 3, and have ceived v9 update recently. They were apparently on 2018.36.* before the v9 upgrade...sounds like a pre-requisite version, and if it is, I am at least one version away from even pre-req version. Does anyone have insights on rollout of V9 to model S, and in general is there a logic to the sequence of version rollout to various models and years?