BD100 requires both a firmware update AND new optical hardware:
Quote:
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Hitachi used an optical disc drive based on the "GBW-H10N" supporting 4x speed BD recording, which Hitachi-LG Data Storage, Inc. announced in July 2006. However, the company made some alterations to the firmware and the optical system inside the head, to make the player compatible with four-layer BD playback. Frontend signal processing (Renesas) and other circuits are the same as those used in the "GBW-H10N."
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source:
http://www.cdrinfo.com/Sections/News...x?NewsId=19493