Unable to update my iPhone 11 to iOS 18.4

Many users met iOS 18.4 software update failed issues. Actually, when a new iOS version is released, Apple’s servers may be overloaded, leading to update errors. Therefore, the reason you can't upgrade could be that Apple's servers are temporarily unavailable or experiencing high traffic.

You can try waiting a while before updating again, connect your iPhone to a computer and update via iTunes/Finder, or use a third-party tool.

“Unable to update my iPhone 11 to iOS 18.4”

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Q1. “Every time I try to download the IOS 18.4 update on my iphone11 it either immediately pops up saying an error occurred when trying to download update or it says “update requested” for a few seconds then says the same error message.”

A1. Try Updating with a Computer:

Use my User Tip: Update your iPhone Using a Computer - User Tip

Q2. “My iphone has almost 20GBs of storage available, it’s connected to strong wifi cause I just updated a different iPhone on same wifi, and it has plenty of battery life, I also have 2.5GBs available on iCloud storage too. Someone please help”

A2. Troubleshooting iPhone Storage:

Internal storage cannot be upgraded. It is what it is. So, the maximum internal storage capacity never increases, even if you upgraded your iCloud plan. Learn More here: What's the Difference Between Device Storage and iCloud Storage? Apple Support

So, what to do...

Clear Space Using my User Tips:

• How to Clear Space from your Mobile Device, and What to Clear: - User Tip. You may have too much installed, and need to clear space.

Troubleshooting iPhone Storage:

Internal storage cannot be upgraded. It is what it is. So, the maximum internal storage capacity never increases, even if you upgraded your iCloud Plan.

Learn More here: What's the Difference Between Device Storage and iCloud Storage? Apple Support

So, what to do...

Clear Space Using my User Tips:

• How to Clear Space from your Mobile Device, and What to Clear: - User Tip. You may have too much installed, and need to clear space.
• How to Clear "Other" in your iPhone's Storage - Use Backup - User Tip. Caches would be being used for remembrance of application use. It is essentially the same for an iPhone. You'd backup your iPhone, and then restore your iPhone from the backup you've just created. All System Data will delete.
• Caches would be being used for remembrance of application use. It is essentially the same for an iPhone. You'd backup your iPhone, and then restore your iPhone from the backup you've just created. All System Data will delete.

You’re not losing anything, don’t update to 18.4 unless you have to. Unfortunately, I made that mistake and now my phone keeps restarting when using different apps, including system ones like the camera or Safari.