What happened when Apple 13 didn't receive the verification code of Worry-Free Star Yao?

Version is too low. Vulnerabilities related to the lower version can't be fixed, the function can't be used normally or the device can't get the verification code when it is running, so Apple 13 can't receive the verification code of Worry-Free Yao Xing because the version is too low. Version is a kind of software running on the device, which can realize the execution, display and management functions of operating system, applications, files and network services.