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My scenario is a jboss 4.3.0 installation with several nodes. Some of the nodes are on CP08, and some are in - say - CP05.

Upgrading from CP05 to CP08 is a no-brainer using "jboss ON", according to the online manual:

Applying JBoss Patches.

My question is, is it possible going the reverse way: downgrading from CP08 to CP05? (And how would you do it!).

If not a detailed explanation, it would be helpful some pointers where I could find answers.

(If you are interested in the reason behind downgrading, it is because the production servers are on a lower CP version. Obtaining permission to operate on development servers is always easier.)

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I might add, that JBoss EAP 4.3.0 version is equivalent to EAP 4.2.1 version with some minor additions. – pga Oct 10 '12 at 10:00
Further investigation shows there is no non-hacking way of downgrading. – pga Oct 10 '12 at 14:18
Maybe you'd like to transform your own comment in an answer (as it is). – S19N Oct 17 '12 at 23:35

As there is no clean path to downgrade a jboss instance, a guess a more simple approach would do the trick:

Create a fresh new CP05 instance and redeploy apps. from CP08 instance.

(Ops, this is an opinion!)

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