SoftKeys No Longer Work Galaxy S4

hey guys ok so i have a samsung galaxy s4 sgh-i337m and my menu and back button no longer work ive been looking for a custom rom that has these buttons on the screen but cant seem to find one can someone point me in the right direction please and thank you :)

how to enable on screen android softkeys

hey Everyone,

I tried to enable the on screen softkeys by editing the build.prop file to add the following line:
qemu.hw.mainkeys=0

This was suggested in many forums and found to be working, but not on the galaxy s4 i guess. When i reboot my phone after adding this line, the systemUI crashes and the phone is totally unusable.
Have anyone tried to do this, or have you ditched the HW keys and enabled the integrated on-screen softkeys on GS4?
Please let me know how...

Thanks!

Softkeys disappear when using keyboard

So I have just noticed this morning when I'm texting....

Everytime I'm using the keyboard, the softkeys below (the back, home, task, and input method button) were... gone. Disappear. I don't know why, it was normal yesterday and I didn't do anything. It makes me kind of difficult everytime I have finished typing, because I have to tap on the screen, and cannot hide the keyboard using the back softkey. I have tried to restart twice, nothing changed. What is wrong? How do I get my softkeys back when I use the keyboard? I'm using the stock Lollipop 5.0.2, not rooted, and never did any modifications at all. Please, can anyone help me? thanks a lot. :( here i put a screenshot to show you what I mean.

I really do need answer to fix this. once again thanks a bunch!

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insanely huge softkeys!!!

does anybody know how to change the insanely huger softkey buttons on stock rom..i change the size of nav bar to 42 but there still huge...does anybody know how to get the aosp buttons on here!!!