I have a tbeam 1.1 with the m8n GPS option, but it showed up with SoftRF firmware pre-installed.
Oddly, when I connected it via USB cable to my Win10 laptop, it didn’t show up as a connected device. A check in the device manager showed CP2104 USB to UART controller as an unrecognized device
I went here: CP210x USB to UART Bridge VCP Drivers - Silicon Labs
And pulled the latest CP2104 univesal windows driver and installed it.
That enabled my laptop to see the unit, and then I was able to flash the latest Meshtastic firmware - tbeam 1.2.39.xxxx - and now it’s up and running.