Need of a device with bootloader unlocked and rooted
1) Install the apk of Root Explorer version 4.0.2 at this link
http://it.apkhere.com/app/com.speedsoftware.rootexplorer
2) Open Root Explorer, go in the system folder and open the build.prop file with the text editor; search the string called
# [ASUS BSP] Nancy - ZE552KL default disable touch navbar
persist.asus.enable_navbar = 0
qcom.hw.aac.encoder = true
and change the value from 0 to 1; then save appropriately the modified file.
4) Now you need to give the right permissions to the file; just keep pressing on the file, then up, about the options that will appear on the file, click on the three vertical dots and then Permissions. You have to set it up as follows
5) Reboot your phone and you should find the soft keys of ZenUI; Now if you want to disable them again it will be enough to re-edit the build.prop files and reset the value to 0.
If you want, in addition, also disable the physical home hardware keys follow these simple steps
1) Download here
http://www103.zippyshare.com/v/sS8EF2Cm/file.html
the Xposed framework compatible with Zenfone 3
2) Download here
http://www55.zippyshare.com/v/YWm75uNz/file.html...
the apk of Xposed app that is need that you install immediately
3) After that, flash the Xposed framework by TWRP recovery and restart the device
At reboot go into Downloads section of Xposed app and research the module named "Xposed Additions". Install it, activate it with the check mark in the Modules section and restart the Zenfone. On restart, launch this application and go in Buttons section; Here click on "Add new Key" and, when you see the screen popup, click on any of the three hardware keys and then confirm with ok. Now go into the rule that you have created (that will bring the name of the button that you have pressed) and click on "Add New Condition"; Click on "Screen On" and then, in subrule that appears, put the check mark on the options "Click" and "Long Press". Repeat the same thing for the state "Screen Off" and "Lock Screen" always clicking on "Add new condition". Now you must only repeat the whole procedure again for the other two hardware buttons on the home and you you will have disabled all of them!
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