I have an ASA 5510 that is used specifically for vpn. This is version 8.4.7 and the idea is to upgrade to version 9.1.3. On the release note of this version said that can be upgraded directly.
I request your collaboration to know if i can actually do the upgrade directly, and how I can know if I should change the configuration for NATs or another parameter
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Yes upgrade path is eligible to go directly
I do not see any changes to the NAT statement, For ACL as they have been unified compare to old.
I would suggest to take full back of config- device OS, upgrade in change window and test it before you put back to live system.
What about the asdm versión, actually version is (Device Manager Version 7.2.1), do i need to upgrade too?, what´s the recommended versión?
Look at the compatible matrix.
Since 5510 is EOL, cisco made some archive and they refer only new model, you need spare some time and do some research documentation for the information you look for.
best i can provide as per my links is this.