Ios 10 apple 7 mobile phone, there is no sound in the software.

Download itunes and prepare to restore the system. Itunes is going to official website to download the latest version.

Backup (you can copy important files directly to your computer, or you can open icloud for backup. Settings-View it in -iCloud, then open it to make sure the backup is successful)

After successfully downloading itunes, install it on your computer. After the installation is successful, open itunes, see the red mobile phone icon below, and click.

Click "Restore iPhone" to restore the system. Note: It is best to set it as a new machine after recovery, so that the previous software and old problems will not be recovered.

The reminder is as follows: According to Apple technicians, the update package of the mobile phone update system in wifi state may be incomplete due to network instability, so there will be bugs. It is recommended to choose a stable network environment when updating.

After connecting the computer with a data cable, it is a safer way to update through itunes. If the situation still appears after this update, you can contact Apple technicians by phone or online and ask them to find out the reason.