hello guys,

i am a new bee to use nokia n950, and unfortunitely,there is only fly mode after I erase the problem n950, I guess something is wrong with the system,so I had to flash it to PR1.2

and I download the image file
Win_OCF_02-6_RM680-RM680-OEM1.EXE
when I flash,I was stopped at
suitable usb interface(bootloader/phonet) not found, waiting...

I did the procedure by switching off the phone and replug it,
but still nothing happens,
do I still need to install any drivers for that like usb driver or what else? where can find it. can N9's usb driver instead?
how to solve the problem,
any other suggestions?
the seller told me that need older computer system,if it is true?
My computer os is win10,need xp or win7? anyone know? or win10 is ok?

waiting on line