1600 LTM SW Dwngrd

Hello All. We have a BigIP 1600 LTM that currently has 10.2.4 on HD1.1 and for some reason we received it with version 11.2.0 on HD1.2. This is in our test system we are setting up and I want to only have version 10.2.4 on it. the HD1.1 has the pre HF7 build and I want to put HF7 on it but want the Pre HF7 build to remain on HD1.1 and want to run 10.2.4 HF7 on the HD1.2 volume. What is the best way to remove the 11.2.0 from the hd1.2 volume then put 10.2.4 with HF7 on volume HD1.2?