Iphone 4s not updating

Help.... I've tried to update the iphone 4s to the new software, but it gave me an error (21 and 26). It said to restore to the factory settings.... I've tried this and it failed, giving me error code 4000..... please help

Hello ereraldisle1,
Thank you for using Apple Support Communities. 
The following articles should help you sort out your issues with updating your iPhone to iOS 8:
Resolve iOS update and restore errors in iTunes - Apple Support
and 
Resolve issues with an over-the-air iOS update - Apple Support
Regards,
Jeff D. 

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