Yellow Bricks has a interesting write up titled : Inject a driver into ESXi
I had my doubts about posting this one cause it definitely breaks your support. But a quick search on google revealed that it has been posted before so if you’re gonna do it why not use “my” procedure. Again I would like to stress that this should only be done for test purposes. Mark Erica was so kind to email me this procedure that they used to replace a faulty driver. The driver would be in the next version of ESXi or probably a patch but due to the severe problems they could not wait.
I found this a great read, and to me it shows the future of ESXi.