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In the second half of Apple's 4s TEPCO micro-calibration, what is the problem that the display is not working at this time?

1. Sometimes it cannot be downloaded due to unstable network. Change the DNS address of the wireless Wifi network to 8.8.8.8.

2. It is also possible that there is something wrong with the app store. It is recommended to bind the APPLE ID at the same time before downloading, so that you can download to the official genuine resources for free. The software can be used normally and will not flash back. The resource update speed of synchronous push is also faster. Generally, there are resources released in the ios market, and the synchronous push will be included in the first time.

3. If you still can't download it, it may be that the software is not credible. Click iPhone Settings-General to open the profile menu. Enter this menu and set it as trusted.