Hi Jay,
Well your question can be answer depending on what you want to do, are you hitting any vulnerability on your 5520's? if not why are you interested on upgrading the ASAs? You can check cisco.com under the software for the 5520's and you will be able to find the latest version of 8.2 or even the latest version of 9.1.
You can upgrade directly from 8.1 to the latest version of 8.2.5.59, these are the release notes for that interim release:
http://www.cisco.com/web/software/280775065/45357/ASA-825-Interim-Release-Notes.html
If you are interested on upgrading to 9.1 you need to consider the changes on the syntax of some commands like nat.
These are the release notes of 9.1:
http://www.cisco.com/c/en/us/td/docs/security/asa/asa91/release/notes/asarn91.html#pgfId-763574
For this version you definitely need to consider the upgrade path:
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Current ASA Version
|
|
|
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8.2(x) and earlier
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8.4(5)
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9.1(3) or later
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8.3(x)
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8.4(5)
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9.1(3) or later
|
|
8.4(1) through 8.4(4)
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8.4(5) or 9.0(4)
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9.1(3) or later
|
|
8.4(5) and later
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—
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9.1(3) or later
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|
8.5(1)
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9.0(4)
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9.1(3) or later
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|
8.6(1)
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9.0(4)
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9.1(3) or later
|
|
9.0(1)
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9.0(4)
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9.1(3) or later
|
|
9.0(2) or later
|
—
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9.1(3) or later
|
|
9.1(1)
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9.1(2)
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9.1(3) or later
|
|
9.1(2) or later
|
—
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9.1(3) or later
|
Hope this info helps!!
Rate if helps you!!
-JP-
