On some versions of Yellow Dog Linux (for PS3), the "boot-game-os" command line gives you an error similar to "/sbin/other-os-flash-util: No such file or directory", which prevents you from getting back to the PS3 XMB.
Below is a simple, step-by-step guide on how to fix the error:
1. Login in as root and go to "/sbin/" using the Nautilus.
2. Open "boot-game-os" in text editor.
3. Change the text "/dev/ps3flash" to "/dev/sdb" and save the file.
4. Now the boot-game-os command line should work properly.