Blackout Comms supports 915, 868, and 433 as of v3.1.5

As of version 3.1.5, Blackout Comms supports 915, 868, and 433 for most devices.

Note that 433 is for non-US only (not legal in the US).

Also you will need to have the 433-tuned versions of whatever hardware you're using (T-Deck, T-Beam Supreme, etc).

To use this capability, update your firmware and on your root device, select 433 when setting up a new cluster.