More than 3 times trial for installing 15.4.1 for iphone6s plus and unfortunately receive an error in instlation. Is there any recommendation?
iPhone 6s Plus, iOS 11
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Follow these directions: If your iPhone, iPad, or iPod touch won't update - Apple Support
There's 4 reasons why your iPhone may not be updating:
- Not enough available storage space on your device
- Downloading the update takes a long time
- Unable to reach the update server
- The update doesn't complete
Click the link I already provided for you to help troubleshoot your iPhone.