What, you thought I wasn't going to self-nerdsnipe? So according to TMo's datasheet[1] the gateway contains a #Fibocom #FG360NA 5G module which itself is built on the #Mediatek #T750 SoC, which (yes it's turtles all the way down) contains a number other MT ICs including an #MT6890 quad-core ARM AP. That processor apparently is running a "driver" designated as “Kernel 4.19 #OpenWRT 19.07 (?)” but according to the previous research it boots Android? Weird stuff.

Wish me luck while I decide whether to attempt soldering headers onto the alleged UART connection of the 5G gateway I am supposed to return unharmed to its rightful owner, eventually 🧯

[1] https://www.t-mobile.com/content/dam/tfb/pdf/tfb-iot/FIBOCOM%20FG360-NA-03%20Datasheet_V1.6.pdf