Error 53 with original Touch ID sensor

Hi,

I own an iPhone 6 with iOS version 9.2

Lately it has been experiencing issues with Touch ID, sometimes it worked and sometimes it didn't. and by "working" I don't mean recognizing my fingers, but actually sensing fingers, it didn't even recognize double tap to lower the screen display.

I upgraded to 9.2.1 and Touch ID stopped working all together. Then I downgraded to 9.2 and Touch ID started working properly again.

Several days had past and it stopped working all together. I tried to upgrade but now my iPhone encounters error 53 and I can't use it.

I don't live in a country that has an official Apple Store. My Touch ID is original, I only fixed my iPhone screen once when it broke at my carrier's lab.

This is RIDICULOUS.

Anyone can share an helpful advice?

Thanks in advance.