The software version is 8.9.28. Mobile phone model: oppoReno7.
The specific steps are as follows:
1. Open the QQ software on your mobile phone and click the contact in the middle below to enter.
2. Then click on the friend; Find a friend and click.
3. Then click the Settings icon in the upper right corner.
4. Click to join the blacklist after entering.
5. Then click OK to join.
6. If you are chatting with a stranger, click on the chat interface to enter.
7. Just click to join the blacklist.