Issue Getting ExpressLRS to work on Radiomaster Boxer

[acoustic trellis]

Hello,

Been trying to get my boxer's ExpressLRS to work. This is my first time trying to get it to go from the factory. From System, tools, expressLRS i just get it stuck on loading. I've tried to set everything to where is needs to be including setting the USB-VCP to CLI, turning the internal RF mode to CRSF, updated EdgeTX to the latest version, etc, but still can't get that ExpressLRS to load.

I then tried to update the ExpressLRS software following the guide (https://www.expresslrs.org/quick-start/transmitters/rm-internal/#flashingupdating-your-tx-module-firmware). Ran into some issues with step 3 but now it identifies that port but I'm still running into a build error. Seems like it's just stuck on connecting and then errors out the first time and then if i click retry it has a few lines but then timeouts quickly after. All the retries after this have the same result. I'm sure it's just something I've missed but I'm running out of ideas and would appreciate any help! Let me know if you need any other info.

[brittle oxide]

Take off the rear module bay and battery bay cover and take a photo of the back of the controller

[brittle oxide]

The 4in1 version doesn't have ELRS hardware inside

[acoustic trellis]

ahhhhhh that makes a lot sense! So is that something I could get and put into that rear module bay?