• Apple posted a support/how-to article on error 53 that notes an update to iOS 9.2.1 to allow a restore for devices that had the Touch ID sensor repaired/replaced by a third party. (When I first viewed the article it was dated Dec. 21, 2015 without any info on an iOS update, but a forced refresh shows a modified Feb 18th, 2016 date, with notes on an update to iOS 9.2.1 to allow a restore using iTunes on a Mac or PC.)
  The revised article also notes:

  "If you believe that you paid for an out-of-warranty device replacement based on an error 53 issue, contact Apple Support to ask about reimbursement."

• Illustrated Guide to XCOM 2 Mods on the Mac (gameagent)
  
  
• Aspyr posts Layers of Fear FAQ (Mac info down the page)
  
  
• Firefox web browser for iOS v2.0
  • Open Firefox tabs from the home screen with 3D Touch
  • Preview pages on your tab list with Peek and Pop
  • Open web pages in Firefox in Spotlight Search
  • Find words and phrases on a web page with Find in Page
  • Save and manage login information with Password Manager
  More details

• If you see error 53 or can't update or restore your iPhone or iPad

Topic-based page of How-To, Troubleshooting & Tips for Mac/OS X/iOS Users.