Software Update Failed Error for iOS 15.7 on iPhone 8

I’m unable to install the update IOS 15.7 on my iPhone 8. I get an error message that software update failed



[Re-Titled by Moderator]


iPhone 8, iOS 15

Posted on Sep 13, 2022 11:01 AM

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Posted on Sep 30, 2022 2:46 PM

I had the same problem -- tried to install iOS 15.7 on iPhone 8 and got the "software update failed" error.


Here's what worked: I freed up enough storage space until I had about 9 GB free. That's it.


I originally tried when I had about 4-5 GB free. It didn't install, and I got the exact same error as above.


I tried again when I had about 7 GB free. It still didn't install; same error.


Once I freed up enough storage space (by deleting apps and things) until I had about 9 GB free, then the update installed, no problem.

84 replies

Sep 14, 2022 5:01 AM in response to Msswanny

I have the same issue on an iPhone SE 2nd gen., which I could not resolve, despite:


  • I have restarted my phone several times. (Following a power off I’ve kept it off for 2 minutes at least)
  • I have enough space available to finish the upgrade.
  • I have tried to update using only cellular data. (Wifi + cellular fails the same way)
  • I’ve been trying to proceed at different times during the day.


To my best understanding this is a server side issue, and it is truly sad that from iTunes I could only update to iOS 16!


This user ‘experience’ is far from what I’d consider ideal in case of an important security update.

Sep 14, 2022 12:04 PM in response to Msswanny

Same for me, same issue with my iPhone 12. I tried all suggestions and hints mentioned in previous comments without success, more than 10 times to try to upgrade in past three days.


BTW, I also cannot install iOS15.7 using iTunes app on computer because as update option only offers iOS16.0


This is unbelievable, first time that happens to me since iPhone 3G, how is this possible? :-(

Oct 20, 2022 1:12 PM in response to Msswanny

To the people claiming you need approx 10+ GBs of free storage on your phone for the new iOS to successfully install...what about those of us who literally can't free up that much memory? My phone's only 25GB, I already transferred nearly all my photos and managed to successfully download the new iOS, which took up 5GB. I have 6.3GB of extra memory right now and literally nowhere to get more memory space from. I've been trying to install it for three hours now to no avail. I need to update my iPhone SE due to WhatsApp policies as they will stop supporting my current version of iOS. Am I seriously supposed to buy a new iPhone solely due to the fact that the update requires an ungodly amount of free memory storage, which isn't even listed anywhere?

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Software Update Failed Error for iOS 15.7 on iPhone 8

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