How to update ios 7 on used iPhone 5?

I purchased used iPhone 5, running with my apple ID, i want to update
my ios 6.1.4 to ios 7
many phones i noticed that ios 7 activation lock problems
so i loss my original owner contact, if i update my ios i can unlock with my
current apple id or original owner apple id
kindly help me please

Connect your iPhone to iTunes and then restore it. While restoring, iTunes shows a message "you want to update your iPhone 5 with new ios 7" something like that you then press yes it might take some hours to finish the update.

If find my iphone is on and signed in with the owners apple id then updating will not bypass this. The phone is stolen. Report to police.

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