Unable to install update iPhone

Try and delete the update file and download it 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 update via a pc or Mac instead

Update your iPhone using a Mac with macOS Catalina or higher

On a Mac with macOS Catalina or higher, you will use the finder in order to upgrade your iPhone. Make sure to Back up your device before starting the upgrade process.

On a Mac with macOS Catalina or later, you will follow the following steps:

1. Open a finder window
2. Connect your device to your Mac via a lighting to usb A or a lightning to usb c cable On the iPhone 15 series, use an usb c to usb c cable.
3. Select your device in the left sidebar of the finder window
4. click general, then click check for update
5. Click download and update.
6. If asked, enter your iPhone passcode

Update your iPhone via a Mac running macOS Mojave or earlier, or on a Windows PC

On macOS Mojave or earlier, or on a windows machine, we won't use the Finder to upgrade your iOS

Instead, we will use iTunes. Make sure to Back up your device before doing any update or upgrade to your phone.

1. Open iTunes
2. connect your device to the computer with an lightning to usb a or a lightning to usb c cable. On the iPhone 15 series, use an usb c to usb c cable.
3. Click device button in the iTunes toolbar
4. In the summary tab, click check for update
5. Click download and update, follow The on screen instructions
6. If asked, enter your iPhone passcode.

For more reference about updating, see this user tip I have written about the subject

Updating/upgrading your iPhone - Apple Community

I have recently encountered this error with my upgrade. Just solved.

NOTE: Even tho you have cleared space for the download - the Installer still requires space to complete the upgrade.

For instance, I was on 62/64GB after the download, but needed to clear another 3+GB before the installer would work.

Removal of apps is the easiest way as you can reinstall those post upgrade (I had 55/64GB remaining when complete).

Best of luck

JRD

Deleting far more from my hard drive did, indeed, allow the update to install. Not helpful of Apple to give a number big enough to download the installer, but not large enough to actually install it.

Try going into iPhone storage and delete the update and then redownload

i had same problem but all you need to do is to restart Iphone and start then, it worked for me

best regards from Serbia

I am having the same problem as you I have been trying to update my phone sense January and it gives me the same error as well what Apple told me you have to go to the Apple Store or if you have a Mac book try to do that

Spoiler Alert: with an Apple Watch 3 (admittedly, ancient) and an iPhone 15 Pro Max(other end of the spectrum), it was necessary to reinstall the WatchOS from scratch. But it did work, once I did that.

I have the same issue! Apple won’t help with other issues on my 15 Pro Max till it’s updated. 😡😡 iOS 17.2.1 already appears to be a crapshoot…

I’ve done a soft reset, cleared cache & cookies, network reset, and made sure it’s on WiFi & plugged in.

issue still present…

Mine did the same, rebooted and says 1%battery. Put in charger and says 0%charging. Keeps dying and reboots. Leave on charger and hours later decides there is 40-70%battery. Got to the stage where phone became useless and I took it to repair and got new battery. Hope it doesn’t f up again…starting to get reeeeal ******.

still can’t update.

delete from storage and try download again.

same error, some bs about not being connected to the internet.

Same here mine is even worse. It started doing what yours did but now it’s turning off and on randomly. It will just shut down as I am using it The Apple sign comes up and then it turns on and it does that like three to four times in a row and works for a few hours but then repeats.

Great tech terms, but end users need more. Soft reset means: shut your phone off and restart it, in plain English. Clear cache and cookies means… well, it means you need to know what app to do this for. OS updates aren’t running through Safari, at least in a visible way, so please be specific as to where these functions be performed.

ok so i got this new iphone 14 pro max as a gift for my birthday, and its making download the new iOS 17.2.1 software update but its been loading for almost 2 days. yes, my phone is fully charged, and yes it’s connected to my wifi. what do i do?

Yep,my iPhone SE 2nd Gen does the same thing repeatedly everyday,also failed to install ios 17.2.1 but it downloaded thou. Please help when you resolve the issue of turning off and on randomly. Thank you

Trying to download 17.5.1 Phone not connecting to wi fi due to software update issue, so only on 5Ge (not LTE) even though connected to wi fi with strong wi fi signal. Without wi fi or LTE internet data almost nothing and software update just keeps saying "update requested"