Step 1: Download the Button Mapper App
Created by ElementalX creator Aaron Segaert, Button Mapper is the ultimate app to create shortcuts keys right away. While still in Beta, the app should work fine with most of the devices and is completely free to download. Simply search for Button Mapper in the Google Play Store or use the link given down below.Download Button Mapper from the Google Play Store
Step 2: Grant Accessibility Permission to the App
Before you can begin using Button Mapper to add button shortcuts, you must grant it accessibility. Launch the Button Mapper app and it will ask you to press the “GO” button and head over to the Accessibility page in the Settings menu.Step 3: Turn any Button into Shortcut Key
Once you are back at the app, you will be able to see the available physical buttons in the form of a list. Tap on the button you want to remap and then continue by pressing the toggle switch next to the “Customize” option.Source: WonderHowTo
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