[Q] MD5 Does not match??

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http://forum.xda-developers.com – Hey everyone, So im flashing my phone back to stock and I followed and downloaded the stock firmwarefrom the stickies thread under the factory image link. Problem is, when I go toflash it, it has a MD5 hash value is invalid error. It talks about this occurence in the guide but does not really answer the question: Why does it not match? And howCan I flash this phone back to stock? Or where is therea valid download so I can do this? EDIT: SO I found that linkon how to return to stock but the other questions regarding why the value has changed would be nice to know. Much thanks to anyone who (HowTos)