iPhone Cannot Update from IOS 7.1.2 to 8.1


i have iphone 5s gsm, when try update 7.1.2 8.1 on itunes message "cannot update firmware firmware incompatible". understand apple still signing ios 8.1 why cannot update? have checked have download correct ispw firmware model, using latest version of itunes.

appreciated
 

try download cdma ispw. happened me before have cdma , gsm links mixed up.
 


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