Hello et.
How do you figure out that the date of the bigip.conf was out-of-date? Checking UCS?
Base on your notes, I guess it's not your case, but if you configure something after completing the image installation process you should manually load the config in the new boot location.
- VIPRION: clsh --slot=<blades> cpcfg <HD1.x>
- NOT VIPRION: cpcfg <HD1.x>
I was searching on 12.1.4.1 known issues and it doesn't seem there is anything related.
https://techdocs.f5.com/kb/en-us/products/big-ip_ltm/releasenotes/related/relnote-supplement-bigip-12-1-4-1.html#KnownIssues
Did you check /var/log/liveinstall.log to check if any error occurred during the installation?
I strongly recommend you to open a support case and let us know any update :-)
KR,
Dario.