Galaxy S6 DUOS (Dual Sim) - No more 2G Network (EEK) - Networking

Hi Everyone,
Telstra here in Australia has dropped their 2g network. The secondary sim on the Galaxy S6 DUOS runs on 2G only.
This has now rendered the secondary sim unable to register on the network and therefor cannot make or receive calls/messages on the secondary sim anymore.
Is there a way to force the secondary sim to be on the 3G network as well? (Thinking firmware?) or is this a limitation of the hardware?
Cheers,
Kris

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