Upgrading ASA 8.2(5) to 9.1.4

I have a site that has very little traffic so I tried out upgrading it from 8.2(5) to 9.1.4 throwing all caution to the wind as there would be no impact if it went sideways.  It seemed to go fine using the ASDM Tools/Check for ASA Upgrades features.  But I had seen earlier that one should be going to say 8.4 and then upgrading to 9.whatever.  Perhaps I am missing something because these get so little use?  Or should that be an ok upgrade path?

And on a related note - how do I get the OS Downgrade tool as a backup?
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amigan_99Network EngineerAsked:
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asavenerCommented:
If I recall correctly, the suggested upgrade path is if you're trying to preserve your configuration.  When upgrading from 8.2 to 8.4, the software attempts to re-write the config to the new version.  In my experience, though, it's only partially successful.

Here's an article on migrating to 8.3 and up; it includes info on how to downgrade:  http://www.cisco.com/c/en/us/td/docs/security/asa/asa83/upgrading/migrating.html
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Pete LongTechnical ConsultantCommented:
Ive not (he says touching wood) had a cisco firewall fail on me during an upgrade.

Back up the ASA first, Then If you're worried go to 8.4 - I've taken a corporate firewall straight from 8.2 to version 9.x the worst I've seen happen is it leave a lot of junk NAT statements in the config that are no longer used.

Upgrade and ASA from command, from ASDM or straight from Cisco

Pete
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asavenerCommented:
Unfortunately, I have had it fail.  First, it might discover previously-undetected problems with your flash file system.  Second, there are significant differences with the NAT syntax, and the converter often fails to convert them properly.

Make sure you fully understand your environment.  Keep a copy of your original config, and if you primarily use ASDM, make screenshots.  If you use VPN, make sure you use the correct command that also displays your pre-shared keys.
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amigan_99Network EngineerAuthor Commented:
Great info.  Thank you guys.
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