iPhone XR: iOS 18.7.7 re-prompt, "Verification Failed

Tap  Settings > General > iPhone Storage

If you see an iOS update there.....delete it

Restart your iPhone and try the iOS 18.7.7 update again

If still no luck.....you will need to get with Apple Support.......Support

Remove the SIM card, upgrade iOS and reinsert the SIM card.

it's 18.7.7 again not 18.7.8 thus why keep trying? Thanks God verification has failed.

P.s.deletion/restart/download did not Helped.

There is no iOS 18.7.8. Apple actually released today a new build of iOS 18.7.7 (22H340) which improves security: https://9to5mac.com/2026/04/01/apple-releases-ios-18-security-update-for-all-iphone-users-update-now/.

Your iPhone shows the previous build of iOS 18.7.7 in Settings > General > About. What does it show when you tap "Learn more" in Settings > General > Software Update?

"iPhone XR: iOS 18.7.7 re-prompt, 'Verification Failed: Is the "Verification Failed" outcome the result of Apple having pulled the update for those phones and the update just not having disappeared yet?"

-------

"Verification Failed":

There is potentially an error connecting to Apple's server. So, if yo u have a computer available, you can try updating through that. Use my User Tip: Update your iPhone Using a Computer - Apple Support

You'd connect it to the computer, and then would perform a Force Restart.

System Status:

As of this reply, there are no errors shown of Apple's System Status: Apple - Support - System Status

Screenshot:

Hello 👋

Yes it's normal, today Apple released a new build of iOS 18.7.7 22H340 but you forgot that it was April fools ! This build is not signed anymore so you won't be able to install it !

Have a nice day 

I am also having the same thing happen. I tried deleting it and restarting my phone and it still doesn’t work. I don’t know if it’s an Apple problem?

it's 18.7.7 again not 18.7.8 thus why keep trying? Thanks God verification has failed.

You are aware that an installation will fail when the battery is in Low Power Mode.....correct?

The update is NOT SIGNED ! Why are we trying to solve a problem that cannot be solved?

I have the same problem. I have an iPhone XS. In the settings on my iPhone it says that iOS version 18.7.7 is installed. The iOS 18.7.7 update installation repeatedly failed. Every time I get the error message "Unable to Verify Update - iOS 18.7.7 is temporarily unavailable. Try again later."

Installing the update via my iMac (2019, Sequoia 15.7.5) also repeatedly failed. I get the error message "The iPhone could not be updated. Declined to authorize this image on this device for this user."

6x6

Thanks for the confirmation, aside from this 'iOS 18.7.7' update..

I'd had other issues for a few hours with my XR iPhone. Seems

to work better after threats of solid blows-with-hammer made

it 'think differently.' Now I can get a second same-name update.

Checked, after my XR chose to function: it let me finish, & send text.

This newest bit said to be about 300k is small, and gave no warning.

(NOW: it says same dysfunctional BS others see now! at 1012PM AKDT)

Said: its still pondering exact size update; and sorting stuff in the XR?

Like a non-gambler casino-card dealer. He knows; we hafta guess!🙃

iOS 18.7.7 failed on my wife's XR yesterday with verification issue; it re-downloaded again today and failed with the same issue so unfortunately the April Fool's "signing" joke still persists as it's now gone past 00:01 on 2nd April US West Coast time

Yes also I Apple probably made a mistake while releasing this update cause they gave an ipsw for the iPad 9 so iPadOS 26 users could downgrade to iPadOS 18, not only that but there was an OTA for every device on iOS/iPadOS 18 so they could upgrade to 18.7.7 from like 18.7.3 (final)

Lots of things so apple quickly unsigned this version, we might get a new build soon !