BenQ W700 Product Service Manual page 38

Note: In case you got USB enumeration problem, the USB no longer recognize your projector!
Please clear the USB items in the windows registry and install the Flashtool USB driver again.
(Ref:
(Step 14) Windows completed the new hardware
wizard.
Press the "Finish" to exit.
(Step 15) Once the Projector Control USB driver is
enumerated, the projector information displayed in
the status windows. Click on the <Check> button to
place the projector in the Flashtool mode. The
purpose of this function is to verify whether or not the
project is successfully in the Flashtool mode.
(Step 16) The projector is switching to Flashtool
mode after click the <Check>
38