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Support All Types of 4K Blu-ray Drive and USB Drives As an UHD drive tool, it is fully compatible with almost all UHD drives on the market, including 4K Blu-ray internal drive with SATA interface, and external 4K Blu-ray drive or USB drives. In addition, whether your UHD drive is using AHCI or IDE interface, both are supported to be downgraded. Truly 'One-Click' Mode Made it Easy for Everyone This handy firmware flash utility is easy-to-use with intuitive interface. No profound knowledge or special skill is required to perform the downgrading process, whether for novices or experienced users. Whatever kinds of 4K Blu-ray optical drive you have, all you need to do is start up the interface and click one button to finish the downgrading process. Supported 4K UHD Drive List As of now, nearly a dozen of popular 4K UHD drives produced by major manufacturers, such as LG and Asus, have been supported. BDXL drives: LG UH12NS40 (internal, SVC code: NS40) Tested LG BP55EB40 (external, SVC code: NB50, USB) UHD friendly drives: LG WH14NS40 (internal, SVC code: NS50) Tested LG WH16NS40 (internal, SVC code: NS50) Tested LG BH16NS40 (internal, SVC code: NS50) Tested LG BH16NS55 (internal) Tested LG BH14NS58 (internal) Tested LG BH16NS58 (internal) Tested LG WH16NS58 (internal) Tested LG BE16NU50 (external, USB) Tested ASUS BC-12B1ST b (internal, manufactured 2015+) ASUS BC-12D2HT (internal, manufactured 2015+) Tested ASUS BW-16D1HT (internal, manufactured 2015+) Tested ASUS BW-16D1H-U (external, USB, firmware version starts with letter A, manufactured 2015+) UHD official drives: LG BU40N (slim, USB or laptop: Fujitsu, Dell, Nec) Buffalo BU40N (external, USB) Tested Archgon MD-8107S-U3-UHD BU40N (external, USB) Tested HP HLDS BU40N (internal, laptop: HP) LG BU50N (internal, laptop: Lenovo) HP HLDS BU50N (internal, laptop: HP) LG WH16NS60 (internal, recommended) Tested We will support more drives in the future.