The disk is write protected

when i try to format my pen drive, a message come "the disk is write protected". so i can't format my pen me quickly please...
i Navigate to the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies. Change the value for the key "WriteProtect" to 0
but not working
after that i try this 5 step...
1. Start > search bar -> CMD and press enter
2. type< diskpart
3. type< list disk
4. type< select disk # (# is the number of the USB key)
5. type< attributes disk clear readonly
still not done...
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More about disk write protected
  1. is there a slide switch on the usb drive?
  2. you may need to reset the NTFS Permissions on that Device if the lock came from another computer.
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