What's the update? I read elsewhere there is no fix or patch for this problem?
BTW, I have found that if I turn recirculate on before turning the car off it prevents the smell.
Have you checked your oil? If not, check it right now and let us know how full it is. If it's overfilled enough (either due to being overfilled at the factory or due to gasoline dilution) it could wreck your engine. You need to drain the oil and get it to the correct level. Just turning your stupid fan to the recirculate mode isn't the right way to fix the problem.
And yes their "fix" for this problem has to to with the programming for the heating unit. Honda USA has been very careful to not admit to having any issues with oil dilution or to make any mention of it with their recalls or service bulletins. Supposedly by reprogramming how the heating system works, it somehow helps with the dilution problem.
I've read that it's not easy to get Honda to agree to give you the software update, but if you and/or your dealer make enough noise you should be able to get it.
Keep us posted as to what happens. Good luck!