Autoboot

# conf t
(config) # config-register 0x2102
(config) # exit
# wr me

ROMMON

# copy ftp://user:pass@192.168.0.10 flash:
# upgrade rom-monitor filename bootflash:rommon.pkg all
# reload

Firmware

# copy ftp://user:pass@192.168.0.10 flash:
# conf t
(config) # boot system flash bootflash:universalk9.bin
(config) # exit
# wr me
# reload