HT201210 Trying to do the latest update to my I phone 4, at the end, I get an error message that the firmware was not compatible

Trying to do the 5.1 I-phone 4 update
when I get to the end, I get an error message
"The iPhone :admin's iPhone" could not be updated because the firmware file is not compatible "
this is the only computer that has ever been used with this phone

Hi Robertfrom Denver.
Did you try the solution given, and if yes, did it work?
I have done several "attempted downloads, and see the full file download, typically taking 30 minutes to complete, and then something goes wrong.
I am happy to suspend AV and FW software, but would like to know if it is a good fix or not first?
HelenfromBroughton Astley

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