Best method to ugrade from 12 to 19.9 ?

Hello all !

I have a bunch of 12.1.02 databases to updateto 19.9 under AIX. I always cretae a new home xxx/19_9_0

I use the newest autoupgrade.jar

build.hash 8ee6880

build.version 21.1.1

build.date 2020/12/14 14:41:34

build.max_target_version 21

build.supported_target_versions 12.2,18,19,21

build.type production

Because I can only download verdson 19.3 i have to apply the RU Patch.

autoupgrade.jar -applyRU does not work and ends with 'invalid home'.

This raises the question : Is it better to patch the new installed HOME before or after the autoupgrade ?

I was not able to find an authorative anser to this question.

Thanks for reading !