def _unlock(self):
if self.locked:<EOL><INDENT>try:<EOL><INDENT>self.device.cu.unlock()<EOL>self.locked = False<EOL><DEDENT>except JnrpUnlockError as jue:<EOL><INDENT>raise UnlockError(jue.messsage)<EOL><DEDENT><DEDENT>
Unlock the config DB.