I have an UC3 product in the market, and whenever my users need to update firmware, I point them to Atmel Flip 3.4.7. After the Microchip takeover the link no longer works.
Do you know where FLIP is now?
In a better world, I'd have something easier than FLIP to offer customer. Now, I have written a simple 13-stage manual for them to follow, complete with homebrew .bat files and all. But what would really rock is an official .exe builder where I upload my binary with instructions, and Atmel/Microchip compile one installation file which sets up the ISP driver and uploads the binary image.