Things to Do Before Installing iOS 9.3.5
If you do decide to install the iOS 9.3.5 update on your iPhone 6, make sure you do a little prep work before you download and install it.
We've put together an excellent collection of tips for you to follow. These are the steps that we take (and took before installing iOS 9.3.5) before every iOS 9 update and they're a big reason why we typically come out of iOS updates unscathed.
It's difficult to predict what you might encounter after installing iOS 9.3.5 so you'll want to be extremely careful. A little prep work will go a long way toward preventing headaches.
At the very least, you'll want to make a backup.
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