Scroll down to Root settings and select root explorer function, after that, allow root acces, asked by superuser and select Mount File System
Scroll up to Path Settings and select Up to Root
Go back to the File Explorer (which should be at /sdcard/) and press Up
Open up adb and redo the code like this:
adb shell su - cd /system/usr/ chmod -R 777 keylayout
also the -r schould have been -R, my bad.. sorry
Then you can alter the necessary files with ES File Explorer, by opening them as text and add those lines and remove the #
You can save the file with menu>Save
If that worked, reboot your phone and your trackpad should be working again.
If it doesn't you can try to alter the other *.kl files.