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iTunes Error: Declined to authorize this image ...

I am trying to restore my iPhone 6S Plus to iOS 10.2, but I keep getting an error:

 

"Couldn't upgrade iPhone "iPhone". Declined to authorize this image on this device for this user."

 

I tried searching it up, but no one had that error before. I saw a thread about a similar error, but none of the solutions worked.

 

img1.png

 

Here's my file name:

iPhone_5.5_10.2_14C92_Restore.ipsw

 

iPhone Model:

iPhone 6S Plus

 

Here's my HOSTS file:

img2.png

Apple's signing authority (called TATSU) is the problem here. Typically, this results from "jailbroken" devices.

 

While I haven't come across this error, you might find information useful:

njorlNov 26, 2016 2:43 PM in response to njorl

Level 1 Level 1 (7 points)
expertise.iphone

 

iPhone

I have a rose gold 128GB and it was updating apps for a couple days, which I didn't select to do, then all of a sudden I get the white screen with apple logo. I'm getting the same error as you. Have you resolved other than doing a full restore and loosing whatever is on your phone?

I am having the same issue and no my iPhone is not jailbroken.

I am having the same issue while trying to restore my iphone 5 back to ios 9.3.2

Downgrading isn't supported save to revert from a beta to the current live release of iOS.

 

tt2

I have the same issue when trying to downgrade from ios 11.02 to ios 10.3.3. I read document and saw that apple support to downgrade to ios 10 for iphone 6 plus. But it can not. Any solution for this problem ?

最后更新：2017-10-19 15:07:59

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