Well, mine has been formatted, which is the same as yours. I asked after-sales and they said it was ok, just download it again. The software says that the certificate is wrong, just download a signature and install it. For details, you can go to Saipan Forum to have a look. As for those models that can be used but not found in management, I am also worried. I don't know where I downloaded them, and some can't be deleted if I want to. What the landlord should pay attention to is that some of them are virus-carrying, which can be installed on the mobile phone without your knowledge and then cannot be deleted.