in 11.3.0 release note, it says to roll forward configuration at least 10.1.0 is needed.
Upgrading from versions earlier than 10.1.0 You cannot roll forward a configuration directly to this version from BIG-IP version 4.x, or from BIG-IP versions 9.0.x through 9.6.x. You must be running version 10.1.0 software. For details about upgrading to those versions, see the release notes for the associated release.
Release Note: BIG-IP LTM and TMOS 11.3.0