upgrade rom-monitor filename bootflash:<rommonfile>.pkg all
ISR4351
ISR 4000 Series IOS Upgrade
The command is slightly different from the 29XX Series
no boot system bootflash:<OLD IOS>.bin
boot system bootflash:<NEW IOS>.bin
upgrade rom-monitor filename bootflash:<rommonfile>.pkg all
The command is slightly different from the 29XX Series
no boot system bootflash:<OLD IOS>.bin
boot system bootflash:<NEW IOS>.bin