iPhone not updating to iOS 15.2
15.2 update not acceptable
[Email Edited by Moderator]
iPhone 6s, iOS 14
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1.
Optimize the range of the mobile network.
See this Apple article: If you see No Service or Searching on your iPhone or iPad
https://support.apple.com/en-us/HT201415
2.
You need strong Wi-Fi, see the following Apple articles:
If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network
https://support.apple.com/en-us/HT204051
Connect to Wi-Fi on your iPhone, iPad, or iPod touch
https://support.apple.com/en-us/HT202639
3.
See also the following Apple articles:
Update your iPhone, iPad, or iPod touch
https://support.apple.com/en-in/HT204204
If your iPhone, iPad or iPod touch won’t update
https://support.apple.com/en-us/HT201435
4.
You need about 6 GB device storage for update.