1. First install the latest version of WeChat and log in.
2. Use the cmd command line to save user data and uninstall the application:
adb shell pm uninstall -k com.tencent.mm
3. Use the cmd command to install the old version apk (followed by the installation package path):
adb install -r -d
4. Log in your WeChat account on the old version.
If the above method does not work, refer to the following method