@julian Thank you!
I use another way which you offer, and reset the admin's password successfully.

To reset the password even if no email is installed:

1. Go to /reset and key in your email. It won't send out the password reset email, but a key will be generated. This key expires after 2 hours.
2. redis-cli to enter the redis console. If redis is installed on a different port, host, or socket, use -p, -h, and -s respectively
3. hgetall reset:uid, and locate the reset id corresponding to your uid
4. Go to /reset/{reset-uid}