rommon 1 > confreg 0x2042 (有些资料说0x2142,但0x2042实测成功)
You must reset or power cycle for new config to take effect
rommon 2 > reset
System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
.......
Would you like to enter the initial configuration dialog? [yes/no]: n
Press RETURN to get started!
Router>
Router>en
Router# copy startup-config running-config
Router#conf t
Router(config)#enable secret cisco或者no enable secret
Router(config)#config-reg 0x2102
Router(config)#^Z .......
Router#sh ver ....... Configuration register is 0x2142 (will be 0x2102 at next reload)
Router# copy running-config startup-config
Router# reload 重启