Upgrading OBI 22.214.171.124 to 126.96.36.199 is quite... ehm... challenging.
My first advice would be: perform a complete fresh installation of Weblogic 10.3.5 and OBI 188.8.131.52. (A so-called Out-Of-Place upgrade). An in-place upgrade is a LOT OF WORK and involves a lot of manual steps and scripting.
But, even the Out-Of-Place upgrade comes with challenges.
First of all, the installation is fine. (Although I tried to install this right after the release of the latest version of Java (7) and I didn't manage to get this up and running so I switched back to using 6u26.)
The migration of the security realm, setting up the Application Roles, everything is fine.
There is actually no need of upgrading the rpd file. Just point Weblogic to the correct file and it works.
But the WebCat is a different story...
In the 184.108.40.206 version of instanceconfig.xml there is this entry in the
section that says: change the upgradeandexit "false" value to "true"
The documentation does not mention this entry. It mentions the previous syntax, which is something like ps:catalog etc. /ps:catalog
Setting its value to true and restarting the presentation server should (I believe) perform an upgrade of the webcatalog.
(BTW: the install doc of the 220.127.116.11 SampleApp also doesn't mention the 18.104.22.168 tag, but the 22.214.171.124 tag)
What I did find is loss of functionality. So the 126.96.36.199 version and the post-upgrade 188.8.131.52 version of the same dashboards act differently.
For instance: Graphs that have conditional formatting no longer animate. And also ALL our gauges lost their footer. because after the upgrade the @1 reference in the footer had changed after the upgrade to @0.
What else went wrong ? I'm still investigating. I'll keep you posted.