LG Nexus 4 with Android 5.1.1. Temporary fix when soft keys not working

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Some people have a software issue with Android where the soft keys (back, home, overview) stop working. Some solutions to this problem are to do a factory data reset or install a 3rd party app with soft key function. If those options don’t work, here is a solution using Accessibility options to improvise until you get a new phone or fix.

Source: Youtube