There is an update available, but I do not know how to manipulate my phone willl

I have a 5 c, with ios Iphone original 7. I have been notified that there is an update to ios 9.0.2 but I don't know if my phone will lag or freeze. I bought my phone recently and I only got android phones previously, and I don't know if there is an option to downgrade or not. Can someone help me?

There is no downgrade option.

Tags: iPhone

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