From the FAQ -

Q: How do I cross flash the firmware on my OEM/re-badge BenQ 1620 drive?
A: If you have an OEM drive or a re-badge and wish to convert the drive to a retail 1620 so you can make use of the latest official firmware upgrades from BenQ you must go to the Unofficial BenQ firmware page and download WinDWFlash.exe and a corresponding firmware in .CVT form.

In this particular case you'll go for the BSLB.cvt or the latest 1640 firmware.

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