HT201210 what is firmware compatibility? Trying to Update iphone4, and it did not due to receiving my iphone not firmware compatibility

What is firmware compatibilty? Trying to updated iphone 4, and the message I received was unable to update due to firmware compatibility

From another post (but has your phone been jail broken?) -
Delete your .ipsw file(s) and try updating again (this re-downloads iOS 5.1.1).  You will find the file(s) at one of the following locations:
Windows XP : Documents and Settings\<User>\Application Data\Apple Computer\iTunes\iPhone Software Updates
Vista/
Windows 7: Users\<User>\AppData\Roaming\Apple Computer\iTunes\iPhone Software Updates
Mac: ~/Library/iTunes/iPhone Software Updates

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