What if Redmi note4 can't send short messages?

This is a problem with Xiaomi's mobile phone system. We need to update the latest MIUI9 system to solve the problem.

The following are some considerations when updating the system:

1. Make sure that the computer is not turned off during the system update, the mobile phone is not turned off during the system update, and the original USB cable is used.

2. When upgrading the system, the data cable is the key to data interaction. If there is something wrong with the data cable, it may affect the update system. At the same time, when updating the system, be careful not to disconnect the data cable.

3. Use the correct ROM package. This is very important. If there is something wrong with the ROM package, it is a terrible thing. It's like a super computer. If you bring a problematic operating system to install, it won't work well after installation or even can't be installed at all. So after downloading the ROM package, you must check it with a program like WINMD5 and compare it with the value provided by the ROM publisher. If it's different, don't use it.

4. Pay attention to the software prompts when updating the system. Whether it is an integrated package or a split package, the software will have detailed prompts during the system update process. After updating the system completely, proceed to the next step. Don't interrupt the update system process before the update system is completed, resulting in an error.

5. Before updating the system, prepare an integrated software package that can work normally. If there is an error in the system update, be calm and don't panic. Prepare a package that worked normally before. There is something wrong with the new version update system. Don't panic, just refresh it. If it really doesn't work, it's no problem to brush the one-piece bag you prepared.