hi newbie here!
ive been trying to update my mega's 16U2's firmware using Atmel's Flip and i'm stuck in the bringing to dfu mode stage - when i short ground and reset pins the arduino does disappear and then pops back as an arduino (not as an unknown device as should be) so i cant install Atmel's usb drivers.
the weird thing is that when i tried to do the same thing with my Uno R3 i wasnt facing any troubles.
i am using windows 7 x64 so if you can refer to some good pc tutorials i will be really happy
please help! i'm stuck on it for a week now and cant wait to start my project! thanks, tali