Something that came to mind after reading all the existing problems with the update iOS18.1.1:
I added a link here but it was removed (possibly because of copyrights) so here is the text instead:
I googled on the reason for the update and it was mentioned in the top search result at google that it was issued because of 2 actively abused security issues. the first is related to mac's on intel so I will spare you the details,
The second issue patched in iOS 18.1.1, tracked as CVE-2024-44309, is a
flaw in WebKit, the engine that underpins Apple’s Safari browser. If
exploited, a user could fall victim to a cross-site scripting attack,
which sees an attacker inject malicious code into a trusted website or
application.
It might be related to your phone being semi-bricked by this update, maybe you were already infected with malware due to an actively misused (zero day?) bug, the whole reason for this update.
So basically wiping the phone and reinstalling everything from the cloud, might be the safest way to go unless the malware is in the backup as well.
Just my 2 cents of today.
[Edited by Moderator]