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2. Back up the mobile phone data (mobile phone number short message, etc.) after starting up, restore the factory settings, and then re-enter the engineering mode;Unfortunately, it has already,3.3. 1 Create Test TableSubject interface and implementation class:Ha Xuesheng, director of the program department of CCTV's financial channel, believes that cultural media, charming cities and industrial capital are the three carriages of the alliance and are indispensable. The "Charming China City-City Alliance" is first a resource platform for the cultural and tourism industry, forming an ecological circle of resource sharing under the framework of "media + city + industry". Secondly, according to the needs of the city, it provides support, assistance and services for strategic planning and tactical guidance in the aspects of city brand building, city image publicity, city cultural tourism resources development, and research and development of innovative and creative products in the city cultural tourism industry. Third, it is an open platform for the exchange of cultural and tourism industries. It is also a platform for the exchange of experiences, industrial cooperation and exchange of needs between cities inside and outside the alliance. Fourth, it is the operating platform of "all-in-one card".1. First handshake: Establish connection. The client sends a connection request message segment, setting the SYN position as 1 and the Sequence Number as x; Then, the client enters the SYN_SEND state and waits for confirmation from the server.The specific code is