Problem upgrading from v11.2.4 to v11.6.0

I have resolved the issue with the following steps:

1. I tried to load the ucs file from the old v11.2.4 using tmsh:

tmsh load /sys ucs /var/tmp/v10orig.ucs.tar.gz no-license

(Note: My ucs files does not contain the latest license. Lesson: Always save a ucs file after re-activating the license.)

This will give more detailed output as to where the problem is. Then I untar the ucs file in that directory:

mkdir /var/tmp/my_conf; cp /var/tmp/v10orig.ucs.tar.gz /var/tmp/my_conf; cd /var/tmp/my_conf/; gzip -dc v10orig.ucs.tar.gz |tar xvf -

Then I edited and commented out each of the problematic parts in config/bigip.conf or other files.

Then I re-tar the directory:

rm v10orig.ucs.tar.gz; tar -zcvf v10confmodified.ucs *

and load the new ucs file again. Repeat this process until it is clear (need to remove the ucs file that has an error in it before tar-up of the dir each time.) Take note of the warnings so that you fix the issues later on. Then I get:

"Post-processing... Reloading License and configuration - this may take a few minutes... Full configuration has been loaded successfully."

Bingo!