FYI the procedure was slightly different for older msl
When the GRUB boot loader splash screen appears momentarily, press the "a" key
The load process stops, enabling you to append arguments to the kernal boot line.
4. In the kernal boot line, type " rw init=/sysroot/bin/sh" (note the leading space) and then, press Enter.
i.e press space once (for the leading space) and type:rw init=/sysroot/bin/sh
5. When the bash shell prompt appears, do the following:
• Type "chroot /sysroot", and then press Enter.
• Type "passwd root", enter a new password, and then press Enter.
• Type "passwd admin", enter a new password, and then press Enter.
Note: Although you can enter unique "root" and "admin" passwords, typically
you would enter the same value for both users.
6. Type "shutdown -f" and press Enter to initiate a system reboot.
If I never did anything I'd never done before , I'd never do anything.....