Upgrade BIG-IP version from BIG-IP 10.2.1 (Big-IP LTM 1600 hardware) to BIG-IP 10.2.4 Build 591.0 Hotfix HF2

Now, Big-IP LTM 1600 hardware run Big-IP OS version 10.2.1. But, now I want to upgrade BIG-IP 10.2.4 Build 591.0 Hotfix HF2.   I think that I must perform as below: 1st, I upgrade version 10.2.1 t...