Hello, I have one sample of sim card backup device, Model Number: XH-028. The device is accusing PWD Error and does not open her functionalities. Like the manual is in Chinese, do not have how to solve the problem to evaluate the product. It would like that they sent me the product manual in English so that I can enjoy of the product functionalities and thus make order to commercialize in my city. Best regards, Clovis Ampuero