How to Enter Rommon Mode Cisco ISR 4221

[mohameddjelouah]

Hello,

i have a problem in my router 4221isr it says that conf t is not support i learned that is a ios problem so i have to boot another ios so i didnt know how to enter to rommon mode cuz i cant acces the config registry cuz i cant do conf t

[balaji.bandi · Accepted solution]

Connect PC with a console cable to the router - power down the device and power and follow the break sequence.

CTRL-C does work (not some times)  break the boot operation

but by sending a BREAK (for example, from putty menu, Special Command --> Break) does work,

[Leo Laohoo]

The router is booting SD-WAN IOS-XE image.