my mac had to be wiped and ive just got it back from apple. ive had bootcamp on it before without any problem. i have a windows 10 disc which is activated so all good.... i run the bootcamp assistant, the first thing it wants to do is download the helper software and copy it to a usb stick. ive tried 2 usb sticks and an SD card. each time ive reformatted it in disk utility as FAT, and run the bootcamp app it says that it cant find a usb stick thats formatted one partition FAT. the two usb sticks are as different as you can get, a pretty new 32 gig stick, and an old freebie 2 gig stick. unfortunately i made the situation worse by unticking the download software box and went ahead with installing windows without it. now its installed windows, started up in windows, but it doesnt recognise my apple keyboard so its stuck. ive tried restarting it holding down the option key but it still restarts in windows !