After restarting

Yurive Said:

"After restarting iphone se 2020- it’s ask for demo update-but can’t conect to the server.What should I do?"

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A Demo Update for what?

What exactly are you updating? If you cannot update because it cannot connect to a server, then be certain you have a strong Wi-Fi signal. If this is of no success, then try using a computer. Go Here: Update your iPhone Using a Computer - User Tip

Yurive Said:

"After restarting: [...]Demo update of what-I don’t know-it’s repeating every time -I’m restarting my IPhone???”

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Providing a Screenshot:

A screenshot would most certainly help. So, please take on, leaving our personal information. Cover personal information (i.e. names with rectangles and such through use of the Photos app. Go here: Take a Screenshot on your iPhone - Apple Support

As a Last Resort...

Reset to Factory Settings:

One thing to consider is to restore the iPhone to factory settings. Use of this Link: Restore your iPhone, iPad, or iPod to Factory Settings - Apple Support. Important - back up first, as mentioned in that link.

Important:

On the iPhone Both Before and After the Reset:

Enable different iCloud settings on your iPhone, so that all is restorable, after the reset...

1. Go to: Settings
2. Tap: Your Name (Top Item)
3. Tap: iCloud
4. Tap: Contacts (so that it is green in-color

Yurive Said:

"It’s in russian-Demo update ,don’t touche your iPhone. And then -Demo update failed."

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Thank you for the screenshot.

Cellular is Enabled:

Looking on the top-left of the screenshot, I can see that your iPhone has Cellular enabled. Are use able to disconnect from Cellular, and use WiFi, instead? If not, you may need to factory reset. So, only an iPhone with 5G can update over cellular. Do you have 5G? So, either use 5G to update your iPhone, or disable Cellular updating it using a computer.

Two User Tips:

• Use an iPhone 12, that is using 5G in order to update over Cellular - User Tip
• Update your iPhone Using a Computer - User Tip

Screenshot:

Cellular is Enabled

You are welcome.