how to update?
how to update this new version
how to update this new version
You do not write which iPhone you have, so it is not certain that you can update. You can see your options below:
You can check your current version here:
Settings → General → About
You can download and install software updates here:
Settings → General → Software Update
Remember to connect to Wi-Fi and a charger. Your iPhone must have more than 50% power to update without a charger connected.
You can find more useful information here:
Update your iPhone or iPad - Apple Support
If your iPhone or iPad won't update – Apple Support (UK)
If you want to update your iPhone via a PC or Mac, see here:
These are the instructions:--> Update your iPhone, iPad, or iPod touch but before proceeding, check if your unidentfied iPhone model supports more recent iOS versions, as per this compatibility list:
how to update?