http://3cbzkrvakrpetjjppdwzbzqrlkmzatjs7jbyazap5gwutj32gcltjpqd.onion
You can perform these steps from a chroot under the installer environment before a reboot, or later in the running system. First, while Debian does set up a getty (the program that displays the login prompt) on the serial console by default, it doesn’t enable hardware flow control.