Optoma EX774 Serivce Manual page 33

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: Appendix-A)
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Windows completed the new hardware wizard.
Press Finish to end the Wizard.
Once the Projector Control USB driver enumerated; the projector
information displays in the status pane. Press the <Check> button
will drive the projector turns into Flashtool mode. This is verifying that
if the projector will switch to Flashtool mode or not!
The projector is switching to Flashtool mode after click the <Check>...
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2008/07/02