I have an N54 JB4 G4 board. I had Terry e-mail me the summer 2012 firmware, which I believe to be the latest made for this board and it's flashed on there. Worked fine when removed by my tech before I went to get my wastegate rattle fixed.
Will take offers but no low balls. Available for shipping on 9/22 or later and also available for pick up near NYC.
Here's the thread where I asked for latest firmware.