Här är lite om samma problem fast en annan telefon:
http://www.modaco.com/topic/349139-adb-fastboot-windows-drivers-for-zte-crescent/
Dessa är då googles fastboot drivrutiner från sdk.
http://www.multiupload.nl/1CZD8UK88O
Sedan:
"64 bit windows 7 ? I think I might know what the problem is.
If the usbid's are different to the ones in the signed cat file you cannot just add them doesn't work.
You have to force it to load going through update driver software -> browse my computer -> Let me pick -> have disk
Then go to the android_winusb.inf file and force it to load.
then you have to prefix all the fastboot commands with what ever is in
Details -> Hardware Ids.
To get the vendor id if its changed
i.e
fastboot -i 0x18d1 flash recovery recovery.img (or something similar)."
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