Cisco ASA 5510 upgrade From 8.0(2) to 8.4

Due to changes made by TrendMicro, I need to upgrade from ASA version8.0(2) to 8.4(7).
Though not required would also like to upgrade ASDM from 7.1(1) to 7.1(5).
Question - is this straight forward download, install, reboot? Or will I need to reformat, reload config, etc.?
holcom86Asked:
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Gary DewrellSenior Network AdministratorCommented:
Not straight forward at all. :(
Major changes were made in the 8.3 release that require you to make many changes to your config. Here is a link to get you started.

https://supportforums.cisco.com/docs/DOC-12690
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Jan SpringerCommented:
Upgrade to 8.2, then 8.3 and then 8.4.

This will ensure that configuration changes get applied properly.  You can do one right after another but I recommend backing up each configuration with a unique file name both to flash and tftp before each upgrade.
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Gary DewrellSenior Network AdministratorCommented:
Definitely backup. jesper that process did not work for us 100%. We have a 5520, 5510 and 4 5505's. 5520 and 5505 worked no problem. 5510 crashed during the automated configuration upgrade process. Fortunately we had spare units so I could test off line.
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Jan SpringerCommented:
i've had not problems with the 5510s.  

i have done the upgrade and rolled back to a previous release and retry an upgrade.

but yes, you could have problems although I think the upgrade process has been improved.

i specifically went with a later release 8.2, 8.3 and 8.4 to avoid upgrade problems.
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