Is Internet connectivity required for syncing with an app? Having to be connected to the Internet is the major inconvenience of Charge HR if I want to check my activity at. Mar 11, 2016 If your iPhone, iPad or iPod won't connect to 3utools on your PC, try the steps below. If you use the third-party phone or cellular device for your Internet connection, try connecting to an alternate network using Wi-Fi or Ethernet. Remove iTunes and all related Apple software. Having a functioning jailbreak out in the wild is, for the most part, an extremely pleasurable and enjoyable experience for compatible device owners, however, things can, and ultimately do go wrong, resulting in frustration and raised anger levels.
Problem Description:Have you ever met with the problem that when you upgrade or restore iPhone/ iPad/ iPad Touch using iTunes, the recovery process stops and iTunes gives you a warning message that “This iPhone could not be restored. An unknown error occurred (2)”.
Why this error occurred?
Apple or other third party security software may prevent the communication between Apple applications and Apple server or the sources on PC.
Solution:
This kind of problem actually can be solved by updating security software, uninstalling security software, or correcting the configuration of security software.
A.Check the third party security apps
Please verify the following items when this unknown error occurred.
* The Settings of your computer’s date, time and time zone.
* You have already logged in as the administrator identity.
* If your PC or router has proxy settings , please try not to use this internet agency.
* Launch the built-in program in iTunes, check the connection and generate the report.
B.Update security apps
Security software company provides update list to their trusted sites and application regularly. If you update or install a newer version of Apple software recently, such as iTunes or Safari, you may solve the issue by updating the security software.
C.Correct configuration
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iTunes can communicate with Apple serve after you update security software. And the security information must be configured correctly, so please contact related site to get support.D. Temporarily stop or uninstall security apps
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If your current security software is not compatible with iTunes, you may stop using it and check it. Please make sure that you already known the necessary verification of this security software before you uninstall it. In order to reduce the security risks of this security software, please ensure that all files required are available and remember to disconnect it from the network before uninstalling security software.
Recently, many iOS users complained that there is an annoying unknown error 3503 in iTunes, which stop them from restoring and updating. In fact, Apple isn’t made a full explanation of iTunes error code 3503 yet.
On 3uTools, the error is “Unable to request SHSH”. And on iTunes, it is an unknown error (3503). After we tested and researched, our developer team find out that this issue may be caused by Apple server. As a result, users can not restore their iDevices using iTunes or earlier versions of 3uTools.
3u Team try our best to solve this issue as soon as possible. And finally, we released a new version of 3uTools, V2.16 to fix this.
#Update log of V2.16 3uTools
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Fix the error unable to request SHSH while restoring.
Support flashing iPhone 8 and iPhone 8 Plus.
Fix a bug that iPhone 6s and 6s Plus fail to downgrade back to iOS 10.3.3 from iOS 11.
Solutions
1. Please click “Check Update” at the right bottom of 3uTools, and then update to the latest version of 3uTools, V2.16.
2. Then you can restore on 3uTools. Please check the network connection and USB connection before you easy flash on 3uTools.
The reasons of the error “Unable to request SHSH”
1. It could be the network problem. Please check the network to see if it is available.
2. The iOS version you want to restore may be closed by Apple, please check.
3. If you try the above solutions but still meets the same error, then please update to latest version of 3uTools and try to restore again.
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