DVD players are simple computers. Each one has a software
program that controls how it plays discs. Since the software
is stored on a chip, it's called firmware. Some players have
flaws in their programming that cause problems playing certain
DVDs. In order to correct the flaws, or in some cases to work
around authoring errors on popular discs, the player must be
upgraded with a replacement firmware chip. This usually has
to be done in a factory service center, although some players
can be upgraded simply by inserting a CD. See 1.41 for more
on compatibility problems.
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