3 Back up Your Device
Things can — and do — go wrong during an iOS update. That’s why it’s always smart to back up your device before attempting to install any software update either via iTunes or iCloud backup. It’s better to be safe than sorry.
On a similar note, some iOS users swear by wiping their device prior to updating. Anecdotal reports seem to indicate that devices that are wiped before updating run faster and “cleaner” than devices that are simply updated. It’s a big hassle to back up, delete all your data, and update but it might be worth it. So weigh your options.