Downgrade Firepower 2100 series

[Psmurali89]

Hi All, 

I need to downgrade my lab FTD from 7.2.5 to 7.2.3- (I dont suppose i have revert option as its been more than 30 days). I understand i need to re-image but i have the below options in my firewall. What happens if i do the below? is it the same as re-image? The fact that i see the old firmware here, which means i can easily revert? Any help is much appreciated. 

Firepower# scope firmware
Firepower /firmware # show package
Name Package-Vers
--------------------------------------------- ------------
cisco-ftd-fp2k.7.2.3-77.SPA 7.2.3-77
fxos-k9-fp2k.7.2.5.208.SPA 7.2.5.208
Firepower /firmware #
Firepower /firmware #
Firepower /firmware #
Firepower /firmware # scope auto-install
Firepower /firmware/auto-install #
acknowledge cancel install show
Firepower /firmware/auto-install # install
security-pack Security-pack

Firepower /firmware/auto-install # install security-pack
version Version

Firepower /firmware/auto-install # install security-pack version 7.2.5.208 force

[balaji.bandi]

Are you managing using FMC then follow below revert to old :

https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/upgrade/management-center/720/upgrade-management-center-72/revert-or-uninstall.html

[Psmurali89]

Thank you, The revert snapshot is saved only for 30 days. In my case its more than 30 days. Can I do the downgrade as I mentioned before? 

[balaji.bandi]

if you ok to take risk of loosing the config ? is that acceptable ?

[Psmurali89]

yes that should be ok.. I got the backup config. Also, i can see revert option in the FMC but it says "management state validate cannot be done, cannot revert". 

So am looking to do as i mentioned initially.. By doing that way, will it revert with the config or its going to re-image completely?