Solution
Enter the discuz installation directory and find the ./uc_server/data/config.inc.php file
You can connect to the server through FTP, or log in to the server directly to operate
Use the following two lines to replace the two configuration lines UC_FOUNDERPW and UC_FOUNDERSALT in the config.inc.php file
These two lines represent the encrypted UCenter password. The password here is Discuz@2019
define('UC_FOUNDERPW', '6a8d7f5a1cc2a62ca6550adf2f1f421f');
define('UC_FOUNDERSALT', '208491');Copy Refresh the login page and enter the reset Discuz@2019 password again to log in. You can successfully log in to the UCenter backend.
After successfully logging in, you can change your password directly in the background.