If you own an ASUS BW-16D1HT internal Blu-ray drive, you likely bought it for its impressive 4K UHD Blu-ray reading capabilities. However, you may have discovered that out of the box, or after a recent update, your drive no longer recognizes 4K UHD movies.
The only safe source for untouched official firmware is Asus’s global support page:
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Unlike standard drivers, flashing the wrong firmware on this drive can permanently lock it or disable UHD reading capabilities.