what do if I doesn’t let me update to IOS15.
Wont let me update when
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What model is you phone?
• If you have an iPhone 5S or 6/6plus, the highest you can update to is 12.5.5
• If you have an iPhone 6S through 13, you can update to 15.3.1
Go to Settings > General > Software Update.
Update your iPhone, iPad, or iPod touch using WiFi -
Update your iPhone, iPad, or iPod touch - Apple Support
Update using your computer -
Update iOS on iPhone - Apple Support