how to reset the Admin password on asa 5506-x K9

[nsr88nsr69225]

hello guys, 

I have installed a FTD image on the Cisco ASA 5506-X K9 and now I have forgotten the admin password, therefore I can not log into the system at all. for the reimaging, I must enter the cli too, but I can't either. when I use the confreg 0x41, the system gives me a warning, (you must reset or power cycle for the new Configuration to take effect), what does this mean? 

could anyone give me a solution, please?

thank you guys. 

[balaji.bandi]

but I can't either. when I use the confreg 0x41,

To take this config reg take effect you need to reload, so new config will have new confreg.

here is the guide to reset password.

https://www.cisco.com/c/en/us/td/docs/security/firepower/quick_start/reimage/asa-ftd-reimage.html

https://www.cisco.com/c/en/us/support/docs/security/firesight-management-center/118631-technote-firesight-00.html

[Milos_Jovanovic]

Hi @nsr88nsr69225,

If you forgot your passworn, you need to reimage your device. In this procedure, you don't need to modify config register. Instead, you need to power-cycle your device (since you can't issue reboot command), and break the boot sequence to get into rommon mode. Follow the guide, and you'll reinstall your device, after which you can configure new password.

BR,

Milos