IPhone 11 Pro max side button not working after installing the latest version

Hello there!

Did you drop your iPhone?

Even if the outside seems fine, your iPhone could be damaged internally.

If not, you can try to restart your iPhone, normally you would do this via the buttons, but that doesn't work in this case.

For that reason, the first thing you have to do is activate Assistive Touch.

To do that, follow these steps:

1. Settings > Accessibility > Touch

2. Tap the AssistiveTouch button, then tap the switch to turn it on.

3. A circle should appear on your screen, click on this circle.

4. Tap on device > more > restart

5. Now your iPhone should restart

If your iPhone is successfully restarted, check if the buttons work.

If they didn't, please contact Apple Support, because I think it's a hardware problem then.

Hope this helps!

Updating iOS on your iPhone should typically not alter the fundamental functionality of the device. In general, iOS updates are designed to enhance the user experience, improve security, and fix bugs, rather than introducing major disruptions to core features. The reported issue of the screen flickering and displaying a white screen after an update is likely caused by factors that are not explicitly mentioned in your post.

iOS updates primarily focus on improving system performance, introducing new features, fixing bugs, and enhancing security. They are designed to preserve your personal data, settings, and information intact.

During an iOS update, your device's operating system is upgraded, but your personal data, such as contacts, photos, messages, and other information, should remain unchanged. However, it's always a good practice to perform a backup of your device before any major update to ensure that your data is safely stored.

It's important to note that while an iOS update itself should not alter personal details, it's possible that certain features or settings may be adjusted or improved with the update. In such cases, you may need to review and adjust specific settings to match your preferences after the update.

Always make sure to read and understand the update details provided by Apple before proceeding with an iOS update, and follow best practices such as backing up your device to minimize any potential risks or complications.

If the issues you mentioned are indeed caused by iOS, it's likely that numerous users who have upgraded to iOS 16.6 are experiencing similar problems. However, in order for the community on this forum to provide helpful responses, it would be beneficial for you to specify the nature of the issue you are encountering. Without this information, it may be difficult for others to address your concern effectively.

With the limited information that you have provided, It is hard to even guess the problems faced by you. 

You may get faster and better responses to your query by --> Writing an effective Apple Support Commun… - Apple ...

Please re-post with detail so that someone else can help.