Hytera X1e firmware upgrade from v4.

Hi I’ve just purchased the hytera x1e firmware V9.02.04.001 being all proud of my new radio purchases but then I hit a block.

The radios are on firmware v4 and cannot be upgraded directly to v9.

I’ve had a google but can’t find any where the get the firmware versions needed to get to v9.

Can anyone point me in the right direction please.

Thanks!