The Sprint Epic 4G is in the midst of an over-the-air system update -- bugfixes, mostly, and not Froyo just yet, though Samsung's Media Hub is now enabled. But if you just can't stand to wait any longer (that'd be a good many of you, we reckon), Andrew Ruffolo in the Android Central Forums has brought us the manual method. All you have to do is download a file move it to your SD card, and follow a couple of instructions. Easy as pie, and it's the same as getting the OTA update, only no waiting. Check it out at the source link. [Android Central Forums]
Update: Video of the OTA process is after the break if you're into that sort of thing.