After you reboot Address Manager, you can boot into a previous version of the software.
Address Manager and DNS/DHCP Serverv9.1.0 use the GRUB 2 boot loader which uses SHA512 encryption for improved security. GRUB 2 also includes a change in behavior from previous releases. Previously, you could log in to the GRUB menu and command-line with a password. Now, you must log in with the root user. For more information on default login credential for Address Manager, refer to BlueCat default login credentials (you must be authenticated to view this topic).
Upgrading to Address Manager v8.2.0 or greater or DNS/DHCP Server v8.2.0 or greater) from Address Managerv8.1.1 or earlier (or DNS/DHCP Server v8.1.0 or earlier) will replace the original GRUB legacy boot loader with GRUB 2 on both old and new partitions. As a result, customers who might have changed the GRUB password on a previous software version will have to use the new default authentication credentials to access the GRUB menu. For more information on default login credential for Address Manager, refer to BlueCat default login credentials (you must be authenticated to view this topic).
When you reboot Address Manager (or a DNS/DHCP Server), the GRUB menu shows two entries: the most recently installed release (the default boot choice) and the previously installed release.
To boot into the previous software version: