If firmware is your thing - you may want to look into Sierra Wireless EM7355, EM7455, etc series. They are linux compatible and have firmware, docs and SDK avai

If firmware is your thing - you may want to look into Sierra Wireless EM7355, EM7455, etc series. They are linux compatible and have firmware, docs and SDK available from the Sierra site. https://source.sierrawireless.com/devices/mc-series/mc7455/ https://source.sierrawireless.com/devices/mc-series/mc7455/