I have an ASA5505 running 8.2.1. Will there be any problem if I downgrade and reboot it into 8.0.4?
The reason I'm looking at doing this is since I switched the customer to this firewall/ISP connection they've been unable to HTTP upload to various sites from any computer/browser reliably. Previously going through a different ISP and a 5505 running 7.2.3, it worked fine.
The one worry I would have when downgrading from 8.2.1 to 8.0.4 is if you have made changes under 8.2.1 and used new features that 8.0.4 does not have, so I think it comes down to how much changes you have made under 8.2.1 from the time it used to run a previous version but if you have not make major chnages using new features in 8.2.1 you could downgrade. I would suggest to look at release notes for both versions and make comparison assesment to be on safe side. Other than simple access-lists ect.. static nating etc..you should be fine.. always backup configs if using different code versions so you can always fall back with a reliable config backup.
Have you troubleshoot the http issue before considering downgrading.