Why I can not update my iPhone to iOS 17.3

If you still can't install the latest version of iOS, try downloading the update again:

1. Go to Settings > General > [Device name] Storage.
2. Find the iOS update in the list of apps.
3. Tap the iOS update, then tap Delete Update.
4. Go to Settings > General > Software Update and download the latest iOS update.

If you don’t see the update in the list of apps or if the issue happens again, you need to update your device with iTunes.

Try updating iOS after each step.

• Try to Forget the WiFi network and add it again
• Try another WiFi network 
• Toggle sets automatically off and then on
• Reset your network settings
• Force restart your device
• Remove any beta profiles, if applicable

• If everything fails: - Use iTunes or Finder (for macOS Catalina+) to update your device instead of over-the-air
• Get help with iOS updates and restore errors - Apple Support
• If you see an error when you update or restore your iPhone, iPad

Ok so l apparently didn't clear quite enough space for the update!!

I deleted a lot more bits off my iPad so l had over 10GB free space and now the update works! Can't believe it was as simple as that.

iPadOS 17.4.1 has been released. Can't you download that version as well? If so, you might want to remove the update file and try to download the update again

1. Go to Settings > General > [Device name] Storage.
2. Find the update in the list of apps.
3. Tap the update, then tap Delete Update.
4. Go to Settings > General > Software Update and download the latest update.

If this is not working please refer to this user tip I wrote about updating your iPhone (but also eligible for iPads) to get further reference

Updating/upgrading your iPhone - Apple Community

Fixed!

I was using iphone Xr with iOS 15. I cleared up almost 10gb of my memory and re-downloaded the installer, it got upgraded to iOS 17.4. I tried almost all the solutions present on the web for this very issue but this one worked at last.

RobertMIV wrote:

I’ve done everything. Plenty memory, have hard reset at least 3 times and still get the same error. VPN doesn’t work, same issue. Is this known issue that Apple is working on or what’s the deal?

If you have a VPN on your iPhone, at a minimum, turn it off. Better yet, unless you are required to have a VPN for a school or employer, DUMP THE VPN. VPN on iPhone is completely unnecessary and can cause issues with updates, etc. You don't need one at all.

Worked for me, thanks! Update was 4.7 gb, iPad had about 4 gb left after downloading update. Kept getting the error message until I came upon your post. Deleted a 12 gig videoI had long forgotten about, and BOOM! iPad is updating nicely now. Many thanks.

I performed a hard reset and that fixed the problem. Updated successfully!

Hello,

Maybe your device is running out of internal storage.

In order to free up space, try uninstalling apps that you don’t use, uploading files to iCloud instead of storing them on your device, and maybe go into your Message settings and change your settings to keep messages for 30 days.

Simply try to store more files on iCloud. Just to warn you, do NOT store apps on iCloud. They will just take up storage and will be inaccessible from your devices.

Hope I could help 👍🏻

I had to delete the update before hard reset to get it to work.

如果有的話你知唔好食咁做 wrote:

Me too , I tried everything

https://discussions.apple.com/content/attachment/9a465265-3e26-4005-90ed-2eebed01b4cd

Turn off the low power mode option.

You need an iPhone XR or higher to run iOS 17.

I’m having this issue too. Trying to update after a fresh re-download and l get the error:

”Unable to Install Update

An error occurred installing iPadOS 17.3.”

I’ve restarted and cleared up lots of space on the iPad too.

I’m not sure what to try now. I currently have version 15.6.1 installed.

Peculiar this one! 17.1.3 failed to update 3 times overnight on auto updates. I tried to update 3 times manually and go that totally unhelpful error message.

I looked on apple and checked my ipad model supported this update - yes

I visited this forum and checked all the answers - checked I had enough memory available - yes plenty

Went and tried the update again and miraculously it worked!!!

Totally bizarre - I didn’t change a thing.

So hopefully if you had this problem, a visit to this forum fixed it by magic - did for me anyway - good luck.

I’m having the same issue. I can’t update my ipadOS from 17.0.3 to 17.3.1. I can download and install the software but once it restarts the OS is still the same. Also, I already use iTunes to update or restore it but it says an error occured. Please help.

1. Broooo me tooo how do i fix ittt?? I cant update to ios 17.3.1 . I have an iphone xr

如果有的話你知唔好食咁做 wrote:

Me too , I tried everything

https://discussions.apple.com/content/attachment/9a465265-3e26-4005-90ed-2eebed01b4cd