The Apple iPhone 5s was announced on September 10, 2013. Repair of this device is similar to the previous models, and requires screwdrivers and prying tools. Available as GSM or CDMA / 16, 32, or 64 GB / Silver, Gold, and Space Gray.

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iPhone keeps restarting and fingerprint sensor sometimes doesn't work


I have an iPhone 5s running iOS 10.3.3. Sometimes it was randomly restarting and the fingerprint sensor didn't work.

Then one day it refused to boot, it just keeps displaying "connect to iTunes"

I then decided to update the OS to 11.2.5 after many error, mostly error 21 and sometimes 9.

Now the phone is updated to iOS 11.2.5 and the phone stills randomly restarting and sometimes fingerprint sensor doesn't work. Yesterday after the phone restarts, I cannot sign in to my apple ID on this phone. Sometimes it would tell me that verification failed, sometimes it doesn't say anything and just return to settings menu.

As additional information, this phone used to be my father's, he had done some repair to this phone, e.g he replaced the phone screen because it kind of pops off (but it can still be used normally), and he also replaced the body since it has so many scratches. the phone then sits unused from august 2017 until now.

Can anybody tell me/help me just what is happening/broken in my phone.

Any help is appreciated.


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1 Answer

So is it finally working correctly now or can you still not sign into Apple ID and use Touch ID? The iPhone 5s is 5 years old now it’s on the end of iOS 11’s list. If the home button was replaced by someone other than the Apple store, Touch ID is permanently broken and can’t be fixed. I have a iPhone SE and my home button stoped working completely and the Apple store needed to replace my iPhone.

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It is working now only after I restore it using iTunes.

so the TouchID might be broken because the screen replacement, I can understand that. But how about the phone restarting randomly?


@beelover I’m not exactly sure but it may be a battery issue. As I said it’s a 5 year old iPhone and if it still has the original battery it probably needs to be replaced. Has the battery been replaced lately?


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