WeChat blacklist recovery, chat records can not be retrieved.
The way to recover the blacklist of WeChat:
Log in to WeChat, in the setting page, click to enter the "privacy" interface.
Click on "Contacts Blacklist", click on the "Contacts Blacklist" interface to select the friends you want to recover, and click on the icon in the upper right corner of the friend profile interface.
In the pop-up settings, select "Remove from Blacklist" to add the friend back.