1- press "SPACE BAR" when asked ( Need to be quick, Just after the "FreeBSD/MIPS U-Boot bootstrap loader, Revision 2.10" paragraph )
2- at the prompt disable watchdog : watchdog disable
4- type "boot -s " ( in single mode )
5- Enter recovery mode by typing: recovery
6- at the CLI prompt type: configuration
7- set system root-quthen plain-text-password
>>> type the new password [ juniper1 ]
type: commit and-quit
8- type "exit" and
9- "Reboot the system? [y/n] y "