#Before you insert USB drive
root@% ls /dev/da*

#Now insert drive into USB port, see which one is new. That's the USB>
root@% ls /dev/da*

#Create a directory for the USB to mount to, then mount it
root@%     mkdir /var/tmp/usb
root@%     mount_msdosfs /dev/da1 /var/tmp/usb

#Run the request system storage cleenup command. This will remove unnessary files but
#keep everything under /root intact. 
root@%     request system storage cleanup

#Run the request system snapshow delete command. This deletes any existing
#recovery snapshots that are stored ont he system
root@%     request system snapshot delete snap*

#Check the date:
show system uptime

#Verify that the date is current, if not:
#example manually setting date to June 7th 2011 at 5:00pm
root@switch   set date 201106071700.00

#Now request the new software
root@%      request system software add <package-name> no-validate

#reboot
request system reboot