I'm not sure if the Fibocom L850-GL was tested but any M.2 LTE modems should work. Can you verify that you are using the latest software/firmware? If you can please provide the output of get_aero_version.py
You can find additional details on enabling LTE modem at the following link, you may have already seen the wiki article already.
Here is my output for get_aero_version.py:
BIOS_VERSION = Aero-01.00.13
OS_VERSION = Poky Aero (Intel Aero Linux Distro) 1.5.1 (pyro)"
AIRMAP_VERSION = 1.8
FPGA_VERSION = 0xc1
Yes I did follow the steps in that wiki. It does mention that the recommended chipset is Intel's XMM 7160, and it looks like the L850-GL is based on the 7360. Would this cause an issue?
Chipset 7360 should not be an issue but the Fibocom L850-GL LTE Modem was not tested with the Aero platform. The following document lists the LTE modems that have been tested.