upgrade F5 bigip 10200 from 12.1.1

Hello Hardi,

The difference between 12.1.1 and 12.1.2 release i that they are part of different "maintenance releases". With maintenance releases, its going to contain bug fixes for the most part and no new features are going to be added, because you are part of the same branch (12.1.x). For more information on our software policy: https://support.f5.com/csp/article/K8986

Having said that, we would always recommend being on the latest release in that branch (whether that's 12.x or 13.x) along with running the latest hotfix version. Whether or not your unit is ready to make the jump from 12.x to 13.x is upto you to determine, depending upon what modules you have provisioned, by going through the release notes for those versions.