The Server Returned an Internal Error On Update or Restore iPhone using Finder on macOS Big Sur/Catalina

Last Updated on Nov 10, 2020

MacOS Catalina or Later MacOS users are installing Update or Restoring iOS on iPhone and iPad Using Finder only. So This error “The Server Returned an Internal Error” comes during Update or Restore iOS device. It’s been a few days since iOS 13 and macOS Catalina has been launched for developers. Though these are not stable updates, so it is not advisable to install developer betas on your devices. However, if you have made your mind and want to install iOS 13 on iPhone, then you would need macOS Catalina on your macOS or latest iTunes version on Windows. Hope you know that with macOS Catalina Apple has withdrawn the iTunes from macOS. But for Windows, iTunes is still the way out to manage the iPhone and iPad.

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I guess you end up with the server returned an internal error while updating iPhone to iOS 13 on macOS Catalina, am I right? If yes, then refer this tutorial and make some change I bet you will be using iOS 13 within an hour. Begin with the first trick,

Fix the Server Returned an Internal Error On Update or Restore iPhone using Finder on Mac: MacOS Catalina

iPhone could not be restored An Unknown Error Occurred

iPhone could not be restored An Unknown Error Occurred

Solution 1: Restart Mac and iPhone

Usually, it is impossible to update the iPhone in one shot. And here you are with the server returned an internal error, which is mostly faced by every person who is trying to update the iPhone. Now, I would recommend you to restart the Mac and iPhone; it might help you to update the iPhone.

Solution 2: Edit/Reset the Hosts File

Editing or Resetting the hosts file on Mac/Windows is the second trick that will eliminate server returned an internal error from your PC. Most of the iPhone updaters fix this error in this step only. Hope you will too, get rid of Server error while updating iOS 13.

On Mac: Edit Host File

Step #1: Launch “Finder” on Mac.

Step #2: Click on “Applications” and then go to the “Utilities”.

Step #3: There, open “Terminal”.

Step #4: In Terminal, type in the command and hit enter, to launch the hosts file.

sudo nano /private/etc/hosts

Step #5: Next, enter the user password. Don’t worry, if you don’t see the password, because it is invisible. Just type and press enter key.

Step #6: Now, you have to use the arrow keys to navigate through the Hosts file.

Step #7: If you see, then add the “#” character at the beginning of the line.

Step #8: Repeat for all the hosts file which contains,

Step #9: Save the hosts file by Control-O.

Step #10: Press Enter or Return to continue.

Step #11: Exit the window by, Control-X.

Again Restart your Mac and Check it fixed or not.

> Edit Host file On Windows:

In the Same, you should add # sign before the line beginning of

Step #1: Launch the “Notepad” on your Windows 10 PC.

Step #2: Copy the following code and paste into the Notepad. To get a code, Go to %WinDir%\System32\Drivers\Etc in the Search bar, Hit the Enter. Open Host file and copy code.

Step #3: Save the file with the filename, “hosts” in “.txt” format.

Step #4: Close the “Notepad”.

Step #5: Type the following path in Search Bar and open it.


Step #6: Now, you have to rename the hosts file to “Hosts.old”.

Step #7: Lastly, move or copy the host file which we have created and saved in Step-3 to the following path,


Step #8: Enter the Password and “Continue”.

iPhone Could not Restored An Unknown Error occurred 2015

iPhone Could not Restore An Unknown Error occurred 2015

The iPhone could not be restored An Unknown error occurred while Restore or Update iPhone and iPad using Finder on Mac, MacBook Pro, MacBook Air.

Solution 3: Also check Apple Server Status

Millions of update and download request are really horrible technically. Still, Apple is managing and giving best service when Apple release new seeds. In that case, you should wait for a few hours or Check the apple system status or Check for Developer status.

Solution 4: Turn off WiFi & Use Ethernet Cable

Might be there is poor Network signal or no internet. You should check first you mac has Proper internet connection to verify your Device on Apple Service.

if Internet is okay, Follow Repeat the Install or Update/Restore iOS on iPhone using Finder in the right way.

The Solutions are over and Still are you disappointed with other solutions, Share us in the comment box. Also, share which solution is worked for you to fix Update or Restore iPhone Error using Finder on MacOS Catalina.

Jaysukh Patel is the founder of howtoisolve. Also self Professional Developer, Techno lover mainly for iPhone, iPad, iPod Touch and iOS, Jaysukh is one of responsible person in his family. Contact On: [email protected] [OR] [email protected]

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