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Unable to upgrade iPhone 7 from iOS 12.0 to 15

I have an old iPhone 7 on iOS 12.0 and I want to use it as a backup. However it won't let me upgrade to the latest iOS 15. It just constantly says it can't verify the update.

I have tried going into storage, deleting the update and downloading it again but I get the same error

"Unable to Install Update" "An Error Occurred Installing (null)".


Any suggestions on how I get around this. Is it because you can't go from 12 to 15 in one go?

iPhone 7

Posted on Jan 8, 2022 3:40 AM

Reply
Question marked as Top-ranking reply

Posted on Jan 8, 2022 5:34 AM

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


Check your Wi-Fi network, see this Apple article: Connect to Wi-Fi on your iPhone, iPad, or iPod touch

https://support.apple.com/en-us/HT202639


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

5 replies
Question marked as Top-ranking reply

Jan 8, 2022 5:34 AM in response to ultimateangling

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


Check your Wi-Fi network, see this Apple article: Connect to Wi-Fi on your iPhone, iPad, or iPod touch

https://support.apple.com/en-us/HT202639


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

Jan 8, 2022 7:05 AM in response to ultimateangling

Did you check also the device storage?

For the update you need about 6 GB device storage.


See this Apple articles below

If you need more space for an update on your iPhone, iPad, or iPod touch

https://support.apple.com/en-us/HT203097

 

How to check the storage on your iPhone, iPad and iPod touch

https://support.apple.com/en-gb/HT201656

 

Clear Other storage on your iPhone or iPad

https://support.apple.com/en-us/HT211686

 

What's the difference between device storage and iCloud storage?

https://support.apple.com/en-us/HT206504

Unable to upgrade iPhone 7 from iOS 12.0 to 15

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