[HELP] How to enable on screen button on galaxy A3 2016 A310F

Hellloo! New A3 2016 owner here.

Quick question, how to get the android on screen button i.e. home, back, and recent apps in this phone?

I tried using the qemu.hw.mainkeys=0, but after restart it will immediately cause "System UI has stopped working" error repeatedly

Thanks!

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