Today is the final chance iPhone 5 users will have to update their iPhones to iOS 10.3.4 in order to keep main features such as iCloud and the App Store working correctly. To prevent this happening and keep these services running, you must update your iPhone 5 to iOS 10.3.4 before 12:00 a.m. UTC.

Apple have been alerting iPhone 5 owners to update their iPhones to iOS 10.3.4 for the last few days as there is a time rollover issue inside iOS 10 which causes main iOS features such as the App Store and iCloud to no longer work.

Apple says the following in a new page on Apple Support:

“Starting just before 12:00 a.m. UTC on November 3, 2019, iPhone 5 will require an iOS update to maintain accurate GPS location and to continue to use functions that rely on correct date and time including ‌App Store‌, ‌iCloud‌, email, and web browsing. This is due to the GPS time rollover issue that began affecting GPS-enabled products from other manufacturers on April 6, 2019. Affected Apple devices are not impacted until just before 12:00 a.m. UTC on November 3, 2019.”

The time rollover is the result of an issue with GPS products inside many devices, with the majority of those affected GPS devices requiring an update on the 6th of April 2019. As Apple have stated, Apple devices are not affected by the time rollover issue until tonight at 12:00 a.m. UTC.

As for the affected devices that do not run iOS 10 (cellular models of the iPad, iPad 2, iPad 3, iPad mini, and the iPhone 4), Apple have released iOS 9.3.6 to fix the time rollover issue.

You can install iOS 10.3.4 by navigating to Settings > General > Software Update and clicking the “Download and Install” button.