First install the latest version of WeChat and log in.

Uninstall the app using the cmd command while preserving user data:

adb shell pm uninstall -k com.tencent.mm

Restart your phone

adb root

• This step is very important, otherwise you will get an error message adb: failed to install xxxxxx Failure [INSTALL_FAILED_VERSION_DOWNGRADE]

Install the old version APK using the cmd command (followed by the installation package path):

adb install -r -d

Log into your WeChat account on the old version.

If the method above doesn’t work, refer to the method below https://www.cnblogs.com/JOUO4/p/9976939.html