Apple has released iOS 9.2.1 update (build 13D20) to fix "Error 53" This error occurs when the user to arbitrarily fix the Touch ID in shops 3rd party not under Apple Store. To fix the error, "Error 53" you have to install iOS 9.2.1 build 13D20. Here's how to proceed with the installation steps in detail.
Before you connect your iOS device to your computer check that iTunes has the latest version by selecting "Check for updates." Then you follow the steps below.
Step 1: Connect your iOS device to your computer via USB. Wait for iTunes to open and connect to the device.
Step 2: Click on the button to the left of the button device iTunes Store.
Step 3: Next, you need a hard reset or restart the iPhone force, by holding down the power button and home button until the screen restarts and displays the Apple logo.
Step 4: After the force restart the iPhone, choose Restore iPhone in the iTunes Summary tab.
Important Note: The process will proceed to delete all the data on your iPhone. If you do not want to lose data, most Mac just hold down Alt / Option or Shift key on Windows and select Check for Update, instead of restoring the entire iPhone. You need to download the iOS 9.2.1 IPSW file build 13D20 here.
Step 5: Select Download and Install then click Agree to agree to the terms.
Step 6: Then iTunes will download the firmware (the time depends on your network connection, download about 2.0GB capacity). The download is complete, the process will be carried out automatically.
Step 7: Do not disconnect your computer and iOS device until the restore process is complete. Time takes about 15 to 30 minutes. The device will reboot 1 or 2 times in the process, to see the screen Hello appear as the recovery process is complete.