FTD 4100 Password recovery Issue

[Dkiptoo]

I have 2 instances of firepower threat defense running on 4100 hardware device and managed by FMC. I have been trying to recover password of one instance of the ftd using this guide  https://www.cisco.com/c/en/us/support/docs/security/firepower-ngfw/213474-change-or-recover-password-for-ftd-throu.html .  After completing and saving the password, I rebooted the device instance and now it is almost 5 hours it is not up yet. Now In cannot access even the chassis manager to check the progress. How do I go about this problem?

[Sheraz.Salim]

trying to reboot this instance again. Is this instance is in production do you have a backup copy incase if you have to restore or rebuild it again. According to the documentation it should come online in 5 to 10 minutes. It might be on halt. can you also see the log messages.

if you have tac support raise the case to cisco tac

[Marvin Rhoads]

If you cannot open a TAC case (first choice) then you can check the chassis manager via console port.

[Dkiptoo]

FTD chassis management interface was able to come back, and therefore what I did was to re enable the Instance because it went to disabled state. But not  we had to  delete the instance from the FMC and re register again, and now the discovering process is still ongoing as indicated on the screenshort below. Now my problem is that being a campus firewall, all devices are not getting reaching DHCP server , despite checking the instance services and showing all services are running from the cli.  Could the registration process be the cause, coz the progress bar indicated it has not finished