adb shell error : exec '/system/bin/sh' failed permission denied (13).

may15

Hello
I am trying to debug ndk library which is part of my android application on RK3288 firefly board. For that i put gdbserver in /System/bin but whenever i'm using "adb shell" command it is giving me this error "exec '/system/bin/sh' failed permission denied (13)" . I tried to flash my board but it was giving match device error.
Can anyone explain me how to resolve this error.
thanks

zhansb

try to run "adb root" first

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