Can I do a software update on iphone 5 without it being on a plan of any sort?

I bought an iPhone 5 from an individual and it needs a software update but I haven't added the phone on to any plan yet. I've tried to update it numerous times but it always says failed. Do I have to add it to a plan for it to update the software?

You don't need to be on any plan to update, but you do need an internet connection to download the package

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I have Wi-Fi but every time I try it says it has failed.

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