Not just some xbox's, from what I've been reading. A whole LOT of them have been having major problems with the new update, especially the earlier 360's such as the '06 - '07 or so models have been having major problems with it. Most of these are the disk
drive deciding it doesn't want to read disk's anymore. This problem is caused by them flashing the drives and loading it with the new stock firmware, and the drive not wanting to accept it.
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