How can i telnet cisco equipament in boot process? For undo the no password recovery in ASR 920?

[leandrogrilli]

Recovering a Device from the No Service Password-Recovery Feature

To recover a device once the No Service Password-Recovery feature has been enabled, use the telnet client only (SSH is not supported). This telnet client is capable of breaking out of the current session by pressing “Ctrl+]” keys together to arrive at the “telnet>” prompt. At this prompt, you can send multiple strings of “send break” during the “#####” boot up window followed by the “Self decompressing the image :” message. You must send five to seven strings of “send break” during the break out session to arrive at the “Do you want to reset the router to factory default configuration and proceed [y/n] ?” prompt. Answer “yes” for the device to boot with the factory default configuration. If Putty client is used for the telnet session, use the break command from the drop down menu. For SecureCRT client with telnet session, press the “Ctrl +break” keys on the full keyboard. The router will not go into ROMmon mode during this recovering process.

If you do not confirm the Break key action, the router boots normally with the No Service Password-Recovery feature enabled.

• Examples

Examples

This section provides the following examples of the process:

• Confirmed Break
• Unconfirmed Break

Confirmed Break

PASSWORD RECOVERY FUNCTIONALITY IS DISABLED
program load complete, entry point: 0x80013000, size: 0x8396a8
Self decompressing the image : ######################################################################
###################################################################### [OK]
telnet> send break
telnet> send break
telnet> send break

[Francesco Molino]

Hi

The only way is to get a console access on it and while booting you interrupt the boot process.