adb connected but unable to send command

coreinstuck

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Aug 6, 2012
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My tablet pc won't boot and also unable to enter recovery mod. When its stuck on logo and connect the cable to pc it is success (no problem), so do when I type adb command such as
C:\adb tools\adb devices.... -----> it show my devices id. But when I type
C:\adb tools\adb shell -----> the result is "-exec /system/bin/sh failed : no such file or directory"
and I have try the following command to mount system
C:\adb tools\adb remount system --------------> It show "remount succes"
So I'll try to retype this command
C:\adb tools\adb shell -----> the result is "-exec /system/bin/sh failed : no such file or directory" still erros

...could somebody in this forum help me with this issue?I have been looking for solution but still not found.
:'(