In our scenario, we took a server which has nfs fileset issue.

Please run the following:

# oslevel -rq
# oslevel -rl 6100-09
# oslevel -sq | head -1
# oslevel -sl 6100-09-03-1415

As mentioned in the first email, you need a baselevel fileset to force overwrite the fileset using the command:
# install -Facd .

Baselevel filesets can be found on the ESS website
If you run into any issues with that please follow the options below:

Registration assistance for ESS (Entitled Software Support):
If you would like to be able to download media in the future, register at this site:
If there are any issues with access to the site or need assistance with it, call ESS Registration Assistance: 1-800-446-8989, option 1 … the phone will beep about 6 times and someone will pickup answering as “Customer software support.” They will assist you as needed.
3) If there are any issues with downloading, please contact as the AIX Install Support team is not affiliated with the ESS site.
An alternative for receiving assistance is by clicking the “Feedback” link on the login page at: