I recommend to contact with F5 support team before taking this action , maybe there are conflicts between your current configuration in V14.1.2.6 and the newer versions.
I recommend to contact with F5 support team before taking this action , maybe there are conflicts between your current configuration in V14.1.2.6 and the newer versions.
There in the recommendations section you can see F5 recommendation for OS upgrade paths in UPGRADE Advisor section shown below.
Follow these step after that
======== Step 1 ========
Please use the below link first to check the hardware/software compatability matrix , so that you can decide which Hardware Platform your device is and then find the compatible list of software OS that hardware supports to conclude your OS upgrade plan.
======== Step 2 ======== Then see what Upgrade paths you can follow to go to the next level of OS based on your hardware platform supports and pick only from those.
Now go and read the below general summary of the BIG-IP upgrade process and includes recommendations and considerations for planning a BIG-IP software upgrade.