Reset Factory and Upgrade iOS

Hi all,
i have iphone 4 and now my software version is 7.1. If i reset factory back to ios 4.2.1 can i upgrade again to ios 6.3.1 ??
Please help me to resolve this problem.
Thanks.
Ruki

No.
You have iOS 7.1, which is the current version.  There is no way to go backward at all.  A reset to factory settings will simply reinstall iOS 7.1.

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