(or SW REV). A phone on Binary 2 cannot be downgraded to Binary 1, making specific "U2" compatible patches essential for repairs. The Problem:

Note: Never download random .exe files from YouTube videos. Stick to trusted repair forums.

If you’re doing volume iPhone 6/6s/7 repairs, this patch is a smart addition to your toolkit. Just don’t expect it to replace solid soldering skills. Recommended for intermediate-to-advanced repair shops, but beginners should study the U2 IC first.