Can’t update iPhone 6s Plus
Currently having 13.4.1 version of iOS but whenever I tried to update, it fails at the end without errors.
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You should be able to update to iOS 15.7.7 assuming that you have sufficient room on the device.
Is updating using a cable and a computer a reasonable option for you?
Update your iPhone, iPad or iPod touch with the Finder – Apple Support (AU)
or
Update your iPhone, iPad, or iPod touch with iTunes - Apple Support
