Upgrading from TMOS v12.1 to v14.1

I have done it on a system with a very minimal config, and had no issues.

F5 recommends that you read the release notes for 14.1 which is HERE and the upgrade guide for 12.1 HERE.

Also, it wouldn't hurt to read the "Fixes and Known Issues" page on 14.1 located HERE.

Just because I had no issues doesn't mean you won't though, so good luck!

Hope that helps! If it does please up-vote and select this answer, it'd be greatly appreciated!

-Dylan