topic Re: ASA5506 USB boot in Rommon in Network Security

ASA5506 USB boot in Rommon

Pedro Mietto — Wed, 11 May 2022 12:24:42 GMT

Hello,

Is there a way, in Rommon mode to download the ASA image from a USB flash drive and boot?

I know it is possible to do that via TFTP by setting up the environment variables and using the tftpdnld command, but I could not find the commands to do it via USB flash drive, without using TFTP server and the GE Mgmt interface.

The main problem is that I have a firewall unit with a corrupted image, so it won't boot past Rommon (it says "Signature verification failed for key #1"). I would like to rewrite the ASA file via USB, and not TFTP/GE Mgmt interface.

The Rommon version is 1.1.18.

Best regards.

Re: ASA5506 USB boot in Rommon

balaji.bandi — Wed, 11 May 2022 12:27:11 GMT

yes you can do follow below thread :

https://community.cisco.com/t5/network-security/my-asa-5506-x-stopped-working/td-p/4498788

Re: ASA5506 USB boot in Rommon

Pedro Mietto — Wed, 11 May 2022 12:52:49 GMT

Hi,

I followed the thread you suggested but I did not find information about loading an image in Rommon from a USB flash drive.

All I could find was the procedure for loading an image from a TFTP server.

Could you point me to where the information is exactly?

Best regards.

Re: ASA5506 USB boot in Rommon

balaji.bandi — Wed, 11 May 2022 13:11:51 GMT

Connect USB : (make sure FAT formated) - 4GB or 8GB USB stick should be good.

ROMMON> dir

You will see the USB disk1 depends on where you connected.

ROMMON> dir disk1: ( you will see ASA image)

ROMMON> boot disk1:asaimage.bin or

ROMMON>copy disk1:asaimage.bin disk0: ( change boot variable to boot)

Once it booted you can copy from USB to Flash and set boot variable to boot from Flash.