How to Fix Error 1035?

by Black Demon
Blogger, Enterprenuer & Activist

WhatsApp error 1035 is a widespread error that I have heard of, experienced, and have come across online. The error usually happens when iPhone users are trying to upgrade their phones to the new version of iOS via iTunes on their computers, but it also sometimes occurs when trying to install certain apps onto an iPhone. error 1035 is inconvenient for users because they can’t add the update or third-party apps without fixing this problem first.

What is Error 1035? error 1035 is specific to iOS updates because the Apple servers cannot process the mobile phone activation information that is requested, causing the activation request containing the mobile phone authentication failure.

It may also happen when iPhone users try to upgrade their phones to a new version of iOS over iTunes on their computers if there is no internet connection or an unstable one.

Reasons for Error 1035

1: The Internet is not stable error 1035 may occur when the internet connection of the Apple servers is unstable, causing devices to be unable to connect to them and so can’t complete activation requests.

In this case, you should disconnect from the Wi-Fi or 3G/4G network and activate your iPhone again with a stable internet connection.

2: Old version of iTunes for Windows

iTunes on Windows can’t send Activation requests containing mobile phone authentication failure with old versions of iTunes, which is the most common cause of the error 1035. So you need download a new version of iTunes from

3: Multiple Apple IDs/Apple Devices error 1035 can also happen when you try to update your iPhone via iTunes on a computer and authorize the installation with multiple Apple IDs or multiple Apple devices, making it impossible for this operation to finish.

In case, you only have one Apple device and one Apple ID at most, please create an new Apple ID without buying anything if you’ve already used up all of them before authorizing the iOS update with yours.

How can I Fix Error 1035?

Luckily, fixing this problem with error 1035 isn’t too difficult for most users who have encountered it, had been solved very quickly, There are the following Methods You have to use to solve this error.

Method 1: Shut down your iOS device and restart it

How to Restart and Force-Restart Any iPhone Model

Firstly, you should shut down your iPhone or other iOS devices completely. Secondly, wait a few seconds before turning the machine on again to see whether this method works for you. If not, there are still more ways for you to fix error 1035 as followings:

Method 2: Delete old iOS versions from iTunes error 1035 also happens when trying to upgrade a device with an older version of iOS which is no longer available in iTunes library anymore because there won’t be any records of the activation request containing mobile phone authentication failure without these old versions.

So, please make sure that only one latest version of iOS available in your iTunes library and try to upgrade your iPhone again.

Method 3: Close iTunes and restart it error 1035 can be fixed by closing iTunes on the computer, then open it up again for re-activating your iPhone after upgrading to new iOS version even with multiple Apple IDs or devices authorized. If you still get this problem after carefully trying the above methods, please utilize another way provided by Tenorshare ReiBoot (for Windows users).

It will enable you to start from scratch without losing any data on your device when fixing error 1035 with a USB cable as long as there is no hardware issue involved in this process which causes this error to appear continually.

FAQ’s for error 1035

1. Why I cannot, update to the latest software if I have already upgraded to iOS 10.3?

– Since Apple has stopped signing iOS 10.3, you can only upgrade your device to the latest iOS version based on iTunes that’s currently taking care of your device instead of the built-in OTA updating service.

2. Why Windows users do not see this error at all?

– Please check whether you are using an older version of iTunes for Windows because it sometimes causes mobilephone error 1035 to appear.

3. What should I do if restarting my iPhone doesn’t work?

– You should try the second method and delete old versions of iOS from iTunes and click on “Check for Update” in your iTunes instead of upgrading your device again and again with the latest version of iOS-based on this software update procedure.

4. Why do I have to connect my iOS device to a Windows computer?

– This is because you might need software named iTunes for updating your iPhone through a USB cable. If you haven’t installed iTunes yet, please download and install it from

5. Does this method always work for everyone?

Ans. No, sometimes mobilephone error 1035 appears not because of the Tenorshare ReiBoot package but due to some other reasons that’s why we cannot give 100% guarantee that this package works all the time except when there are hardware problems involved in this process which cause this problem to appear repeatedly although you start up with an older version of iOS on your device.

Conclusion for error 1035

Now, I think you have known the causes and ways to fix error 1035 and other problems related to iOS update such as dfu mode, dfu bootloader or DFU Mode, stuck issues on your iOS device.

Today we end this article here, and if you still have any problem with trying out these solutions but are not sure whether it works for you or not, please feel free to leave us a message below, and we will get back to you as soon. As possible! I hope everything goes well on your iPhone or iPad now!

Content:// which is a link or a code is generally used to set default home pages in browsers. If you are a smartphone user, then you would definitely know that the mobile phone is always integrated with a browser and a default homepage. 

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