Originally Posted by WhiteDwarf72
It really works on my K4 but I've stuck now with driver.
You need to install libusb-win32, as discussed in the "select boot" thread/
If you are running a 64-bit windows, you need to boot into "allow unsigned drivers" mode.
Or, you can instead run imx_usb_loader from the command line, instead of MfgTool. It is cross-platform, but simpler to run it from linux, so you do not need to deal with windows device driver issues like you do with MfgTool...