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I know I need to edit /system/usr/keylayout/Generic.k when I edit the Generic.k file I change

key 114   VOLUME_DOWN
key 115   VOLUME_UP
to

key 114   BUTTON_R3
key 115   BUTTON_L3
Unfortunately nothing happens. I've tested it in GTA: SA and both volume up and down still functions as volume control. Can anyone help me?

UPDATE:

I edited the Generic.k file to

#key 114   VOLUME_DOWN
key 114   BUTTON_8
#key 115   VOLUME_UP
key 115   BUTTON_9
& edited rk29-keypad.kl to

#key 114   VOLUME_DOWN
key 114   BUTTON_8
#key 115   VOLUME_UP
key 115   BUTTON_9
The only problem now is that none of the physical buttons on my unit even works anymore. All I can use now is the touchscreen. Is it even possible to configure the L3 & R3 buttons on this device? At this point I've given up. I don't have know what else to try.

Try with tincore keymapper. It allows you to change keycode for any key. It's a bit tricky to use though, but better than editing kl files. L3 and r3 in Android are generally Button_thumbl and button_thumbr, instead of button of button_l3 and r3 which are not generally used in any joystick driver. If you re-edit the kl files try with button_thumbl and button_thumbr, and are members to set correct permissions for the file.

Thank you!!!! That actually worked. I edited the Generic.k file to

#key 114   VOLUME_DOWN
key 114   BUTTON_THUMBL
#key 115   VOLUME_UP
key 115   BUTTON_THUMBR
& edited rk29-keypad.kl to

#key 114   VOLUME_DOWN
key 114   BUTTON_THUMBL
#key 115   VOLUME_UP
key 115   BUTTON_THUMBR
I can finally play games like GTA SA now. Thanks a million for the tip and for the amazing legacy ROM!