Cisco engineering mode, removing mirroring and recovering mirrors

Remove iOS Mirroring method
Router#show Flash

Router#delete Flas
Router#delete Flash:
Delete filename []? Enter the name of the iOS image you want to delete enter
Omit the delete process!!

Router#reload after restart, enter engineering mode Rommon 1 >

Recovery Upgrade iOS method, if one day you were hacked malicious damage deleted iOS image cause route without iOS mirror full network crash, for example, restore iOS image file as follows

Rommon 1 > ip_address=1.1.1.1 Router address
Rommon 2 > ip_subnet_mask=255.255.255.0 Subnet mask
Rommon 3 > default_gateway=1.1.1.2 tftp-server-ip Address
Rommon 4 > tftp_server=1.1.1.2 tftp-server-ip Address
Rommon 5 > tftp_file= iOS image name
Rommon 6 > tftpdnld Download iOS image

ip_address:1.1.1.1
ip_subnet_mask:255.255.255.0
default_gateway:1.1.1.2
tftp_server:1.1.1.2
Tftp_file:c2800nm-advipservicesk9-mz.124-15.t1.bin
Invoke This command for disaster recovery only.
Warning:all existing data in all partitions on flash'll be lost! Prompt whether to download

wish to continue? y/n: [n]: y Note case
Omit Download Screen!!!!!!!!!!!!!!!

Rommon 7 > Boot restart
After restarting you will find that the file has been returned, I have tested several times, which is used in the case of the whole network crash
If you're routing everything OK, you just want to upgrade iOS as follows
Router#copy Tftp:flas
Router#copy Tftp:flash:
Address or name of remote host []? 1.1.1.2 TFTP-SERVER-IP Address
Source filename []? Enter iOS image name return
Last Reload reboot complete
I've got a pain in my hand,!!!!!!!!!.

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Cisco engineering mode, removing mirroring and recovering mirrors