F5 3600 OS Upgrade from 11.2 to 11.6

No, nobody can. You'll need to take a very close look at the release notes for each version since 11.2 through to 11.6 and pay particular attention to any behaviour changes listed.

I'd also highly recommend you do a search here at DC for 'upgrade' and trawl through the results to find out about any 'gotchas' and the like.

Ideally, you would test the upgrade in advance on a test box. If that isn't possible, I'd plan and prepare for issues (and possibly rollback) the first time you try this.