Iphone4 mobile phone wifi can not connect how to do

After the iPhone is upgraded or jailbroken, or after a certain day of restart, it is found that WiFi is suddenly unable to connect. Is there any solution to the problem? Method steps: 1. First we find and open the settings and then select General 2. In the general module select restore 3. Then we choose to restore the network settings, restart to see 4. If not, we try to open the Bluetooth to see if you can open 5. If Bluetooth can't be opened yet, we try to focus on the system to see if it still doesn't work, then the module is broken and can only be repaired.

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