Help editing "/sys/devices/virtual/switch/hdmi/state"
I tried to edit the file "state" in "/sys/devices/virtual/switch/hdmi/" to unlock HDMI checking according to some internet posts I found. The problem is that it won't let me edit the file. I used Root explorer. My phone is rooted.
I also tried using Terminal emulator + Busybox to directly edit the file but it still didn't work. The file can be copied to other directory, and the copied file in the new directory can be edited, but the original file cannot be deleted or edited. When I tried to delete it, the message showed "Operation not permitted".
Any idea? Do I have to use "mount" command ? If so, please suggest. I am new to android and linux.