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I think I've found a solution with an app called Screen Filter.
This app can dim the screen but I leave slider set to 100% so the brightness isn't changed. You just need to untick the option for the soft key back lights.
After you set the app, lock your phone so the screen and lights go off. When you unlock it again the soft key lights should stay off.
Give it a try if you can't find anything better, hopefully it will work for your phone too.
Hey, do those lights use much battery power or is it negligible? I might try it just for that!I think I've found a solution with an app called Screen Filter.
This app can dim the screen but I leave slider set to 100% so the brightness isn't changed. You just need to untick the option for the soft key back lights.
After you set the app, lock your phone so the screen and lights go off. When you unlock it again the soft key lights should stay off.
Give it a try if you can't find anything better, hopefully it will work for your phone too.

