[Q] How to disable safe mode? topic

My phone have stucked in safe mode long time（so sad...）,because the volume button are very difficult to control.I try to research some information:

frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
feMode= menuState > 0 ....................................." this line change into "mSafeMode = false "

So I extract system.sin from Adroid 4.3 TFT，and open it.But the file “frameworks” isn"t have base file,if I find,I also don't konw how to edit java file,replace the file and pack them...
Moreover，the file ”qwerty.kl“，if I delete the “key 114 VOLUME_DOWN"&"key 115 VOLUME_UP ",would I enter safe mode when boot？
Can anyone give me advice？I am not good at English，thanks a lot...