It is known that the "Upgrade to New DB2 Releases, Modes, and Function Levels" in the Installation Guide should be seen for upgrade of DB2 releases, Modes, and Function Levels.
In the customer site, the Post-Install Tasks were not performed at all after the fallback from V12.1 to V11.1. And the DB2 V11.1 after the fallback was able to run without problem. (The SETUP00 was changed after the fallback.)
Doesn't the Post-Install Tasks need to be performed after the fallback to V11 from V12?
Release : 20.0
Component : DB2 Common Components