Unless you want to tweak Andúril’s settings before compiling, you don’t need to bother with Atmel Studio.
ToyKeeper provides some ready-to-flash hex files for several lights.
While Andúril was in early development, I used Atmel Studio 7 to build hex files. I continue to do so because like to disable the boundary blinks at the top and bottom of the ramp and slightly lower the value for HOLD_TIMEOUT to make the light respond quicker to button presses.
To flash a hex file to a driver, I use avrdude 5.10 run from the command prompt of my Windows 7 PC. ToyKeeper pointed me to the correct fuse values, which are located in the flash-85.sh script. Replace ANDURIL.hex with your hex file’s name:
avrdude -p t85 -c usbasp -Uflash:w:ANDURIL.hex:a -Ulfuse:w:0xe2:m -Uhfuse:w:0xde:m -Uefuse:w:0xff:m
Give it another try! I posted some details about getting the Emisar drivers loose in a different thread. I’ve successfully opened five Emisars without damaging anything.
ToyKeeper wisely suggests lightly filing or sanding the perimeter of the driver to remove excess adhesive before reinstalling.