Here I will teach you how to add 3 button navigation to your f21 pro
Pls note you must do this guide first
Step 1
Download and install mt manager
Step 2
Go to system/build.prop and copy it to user
Step 3
Open build.prop in user and push the the dots on the top right corner and push search
Step 4
Search for
qemu.hw.mainkeys
and push the next button (it’s right under the search bar) the results should be #qemu.hw.mainkeys
Step 5
Modify #qemu.hw.mainkeys remove the #
Step 6
Push the save icon on top of mt manager and exit build.prop
Step 7
copy the file and replace it back in system then reboot
Congrats your phone now has 3 button navigation!!!
Pls give a like if you benefited from this guide😜