How to prepare my iPhone 5 to be downgraded after iOS 7 comes out?

My iPhone 5 is currently running iOS 6.1.2. I'm looking to sell it on eBay in January when my contract allows me to get an iPhone 5S. However, I anticipate that iOS 7 may run slowly on the iPhone 5, so some people might want 6.1.2.

So how can I be prepared to do this? I want to offer it on eBay, and ask buyers to message me if they wish to buy and want it downgraded.

I highly doubt they will want iOS 7 to be downgraded. And if they really do, they shouldn't bother you with that and they should do it themselves.

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