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Password Reset

If password recovery was permitted. 

You can RECOVER the devices's configs by logging in around the old password.  This is possible if the command 
set system ports console insecure
was not set.  

Powercycle the firewall and press the spacebar at the prompt in the boot process.  
U-Boot 1.1.6-JNPR-2.0 (Build time: Nov 17 2010 - 07:04:52)

SRX_100_HIGHMEM board revision major:0, minor:0, serial #: AT0213AF1088
OCTEON CN5020-SCP pass 1.1, Core clock: 500 MHz, DDR clock: 266 MHz (532 Mhz data rate)
DRAM:  1024 MB
Starting Memory POST...
Checking datalines... OK
Checking address lines... OK
Checking 512K memory for U-Boot... OK.
Running U-Boot CRC Test... OK.
Flash:  4 MB
USB:   scanning bus for devices... 3 USB Device(s) found
       scanning bus for storage devices... 1 Storage Device(s) found
Clearing DRAM........ done
BIST check passed.
Boot Media: nand-flash usb
Net:   pic init done (err = 0)octeth0
POST Passed
Press SPACE to abort autoboot in 1 seconds

Type boot -s at the loader prompt
Type '?' for a list of commands, 'help' for more detailed help.
loader> boot -s

at the shell prompt, type recovery
System watchdog timer disabled
Enter full pathname of shell or 'recovery' for root password recovery or RETURN 
for /bin/sh: recovery

This puts you back to the command line, where you can enter in the normal commands to set the admin account.  Here you can do the following: 

If password reset was not allowed: 

Press the RESET CONFIG button on the box for 15 seconds or more (until the status LED turns red) .