T-Beam can't receive on LongFast

I have this T-Beam: T-Beam

I used the web flasher to install 2.2.17.dbac2b1 Beta.

I also have a T-Beam Supreme. Communication between the two works fine if I set the lora to ShortFast. But on LongFast, the regular T-Beam can’t receive anything.

I’m in the US. Any ideas on why it doesn’t work on LongFast?

I found the problem. I had to flash the T-Beam Supreme to the latest firmware. Both units are able to communicate on LongFast now.