For what it's worth... I don't often use my MagSafe charger, because 1. it's too slow, and 2. it gets too hot. I dug it out of my desk and plugged it in my MBP after seeing this article. The firmware # changed within about two minutes, and I left it attached to the phone. Miraculously, it didn't get nearly as hot while charging. If that's the change it brought, great!