How to update IOS 12.5.6
How to update iPhone 6s when is on IOS 12.5.6
iPhone 6, iOS 12
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What happens when you go to Settings -> General -> Software Update -> Download and Install?
Do you get any error message?
If it is an iPhone 6 you can update to iOS 12.5.6.
If it is an iPhone 6S you can update to iOS 15.7.2.
You need about 6 GB device storage and good Service & Wi-Fi.
If they are On, turn Off Hotspot & VPN.
Charge the battery > 70%.
See the following Apple articles:
Update your iPhone, iPad, or iPod touch
Update your iPhone, iPad, or iPod touch - Apple Support (IN)
If your iPhone, iPad or iPod touch won’t update
If your iPhone, iPad, or iPod touch won't update - Apple Support
You can do the update via PC, see this Apple article: Update software on iPhone, iPad or iPod touch in iTunes on PC
Update software on iPhone, iPad or iPod touch in iTunes on PC – Apple Support (UK)
If you have a Mac see this Apple article: Update your iPhone, iPad, or iPod touch with the Finder
Update your iPhone, iPad, or iPod touch with the Finder - Apple Support
