Warmly Tips:
Limited by Android 8 and higher version, the phones with Android 8 and higher version cannot flash the lower version(You can check the current version of your phone in Settings>System update).
Your data on your phone won`t be cleared. However, we also recommend you back up your important data such as contacts, messages before doing it. Moreover, make sure the battery capacity is sufficient (over 30%).
1. Download the corresponding firmware for your phone
Access the local official website>Support>System update>select the model which you want to the installing package of.
2. Move it to the root directory of your phone storage or SD card without decompressing;
Note: The root directory is basically the first thing you see when you open a file explorer on your phone. In other words, do not put the file in a folder. The files which you can find in Phone storage interface of File Manager locate the root directory.
3. Install the firmware:
If you can access the phone: Go to Settings>System update>click settings icon at the top-right corner>Local upgrade>click the downloaded package to install it.
If you cannot access the phone: Reboot the phone. After the screen turns black, hold and press Volume Up button and Power button simultaneously until you access FASTBOOT Mode. Select Recovery Mode by pressing Volume Down button, and press Power button to enter it. After accessed Recovery Mode, click Install software>Phone memory>click the downloaded package, tap Install..