Apps are not syncing after iOS 18.3.1 update on my iPhone

Do-i-care-2023 wrote: "The max capacity is 89%"

Do-i-care-2023 ~ Your iPhone 12 Pro Max could be 4½ years old and that high 89% Maximum Capacity suggests that the battery may have been replaced. So please go here:

Settings > General > About > (Parts & Service)

...Does it say anything there about the battery being "Unknown ⚠︎" like this?:

iPhone parts and service history - Apple Support

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"Apps are not syncing after iOS 18.3.1 update on my iPhone: Ever since the 18.3.1 update on my 12Pro Max none of the iPhone apps (messages, notes, passwords, health,photos) are syncing. Since 2/18. Other Apps continue to sync. Have reached out to Apple with no solution thus far. I did the new update hoping this would help but it didn’t"

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Apps Not Syncing:

A. Perform a Force Restart:

Having issues after updating, save what need be, and then perform a Force Restart: Force restart iPhone - Apple Support

B. Perform a New iCloud Session:

Log out of iCloud in settings, and then log back in.

C. Clear the Caches.

Clear "System Data":

Clear the storage named "System Data" (formerly called "Other"). It basically contains unnecessary files such as caches that are used for system ease of use - all of which gather over time: How to Clear "System Data" in your iPhone's Storage: - User Tip Caches would be being used for remembrance of application use. So, clearing other may be the way to go about this, as it would be performs through use of a computer.

iPhone 6 update please

Ever since the 18.3.1 update on my 12Pro Max none of the iPhone apps (messages, notes, passwords, health,photos) are syncing. Since 2/18. Other Apps continue to sync. Have reached out to Apple with no solution thus far. I did the new update hoping this would help but it didn’t

Do-i-care-2023 wrote: "...There are now more problems since I have updated to 18.4 on Friday with apps shutting down..."

Do-i-care-2023 ~ Apps shutting down can be a symptom of a weak, aging battery and the long process of applying an iOS update to an iPhone with a weak, aging battery can be the proverbial "straw that broke the camel's back." So...

Does your iPhone 12 Pro Max still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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Do-I-Care-2023 :: I would recommend updating to the current versions of IOS, some of the earlier builds have some issues as I have had this issue earlier on in ios18. Update to current ios18.4 and also do a hard reset on the device.

[Edited by Moderator]

Update to iOS 18.4