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ishaan146 Author

Level 1

4 points

Ios 15.4 issues

How do I fix my iphone 11 pro max’s cellular update failed issue even after updating to ios 15.4?

Posted on Mar 26, 2022 11:48 AM

Top-ranking reply

Lawrence Finch

Level 10

216,536 points

Posted on Mar 26, 2022 11:49 AM

Go to Settings/General/About and look at Modem Firmware. Is the entry blank? If it is you need to reinstall it by restoring the phone to factory settings, then restoring a backup. Back up the phone first, of course:

How to back up your iPhone, iPad, and iPod touch - Apple Support
Restore your iPhone, iPad, or iPod to factory settings - Apple Support - follow the instructions to restore using your computer, do not using Settings/General/Reset (which is not included in those instructions)
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

If the modem firmware DOES have a value you may have a hardware problem. The first step is what I just posted, but after that you need to contact Apple support using the Get Support link at the top of this page.

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Ios 15.4 issues

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