After turning on the iPhone, there are only phones, no text messages, no settings, no browser and no connection to the computer. Can't get into DFU. What should I do?

First of all, you said that the lack of SMS-settings-browser and other things is a problem of IOS system, which rarely happens on mobile phones after jailbreaking. Basically, it is enough to restart or brush the phone. Secondly, you said that the problem of not connecting the computer is that the computer does not recognize that there is no driver or that there is something wrong with the tail plug. This needs to be confirmed first. If I enter DFU mode, I will go straight in by feeling. ...