Upgrade/Downgrade BIG-IP VE (lab license)

You should be able to move between version 12 and version 13 without issues. If you wish to drop down to version 11, I would suggest you install version 13 and downgrade to version 11. This should work, but will not copy your configuration. You will need to manually reconfigure your unit after downgrading.

I cannot guarantee that early versions of 11 or versions of 10 will work on the newer VE.

Note that you will likely be unable to install an earlier version of 11 and upgrade as the size of the distro can become a problem. Also, if memory serves we changed some of the default hardware settings between early 11 and later 11.

You should not need to move the license as long as you don't deploy a new OVA.

Version 10 was massively different than version 11 (especially where HA was concerned) and instructions for upgrading from version 10 to version 11 are not in any way applicable to the 11-12-13 upgrade paths.