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I have copyed the 'su' command to /system in adb. but i cannot run the 'su', 'su' says: Permission denied.

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I'm not sure what device you are using, but z4root will allow you to root Droid X (as well as Droid I believe). It should provide temporary and permanent root access. As always, you use this at your own risk.

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Install the Superuser app from the Market and reboot. Then try running su from adb with your device connected to your computer -- Superuser should pop up a notification on the phone asking if you want to allow it to run. Then you can use it. Note your phone must be rooted.

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