for panny bodies, its so easy. Just download the firmware file on a formatted SD card, put in camera, press the review button and it will update the firmware.. and its done is approx 2 min. hmm.. wonder why oly isnt allowing update via SD card.
Because Oly's method provides more control of the firmware and safety for the user, in preventing people from posting COUNTERFEIT firmware online.
With the Panasonic firmware, someone can download the file, decompile it, put in all sorts of garbage, and then post it online claiming it to be better...meanwhile it bricks your camera, you have to pay Panasonic $$$ to have it fixed, if they will even touch it since you installed (either intentionally or by accident) unauthorized firmware.
Having been through this and bricking a modem (I actually thought I was downloading firmware from the manufacturer), I'm thankful for Oly's method.