The LTE modem inside an IG60-BL654-LTE can be enable with the following command:

echo 0 > /sys/devices/platform/gpio/lte_on/value

A succesfull action will be indicated by two USB interfaces appearing:

# ip addr show

1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

       valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host

       valid_lft forever preferred_lft forever

2: eth0: mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000

    link/ether fa:87:d7:c4:c1:e3 brd ff:ff:ff:ff:ff:ff

3: eth1: mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000

    link/ether 36:42:a6:34:a7:4e brd ff:ff:ff:ff:ff:ff

4: wlan0: mtu 1500 qdisc mq state DOWN group default qlen 1000

    link/ether c0:ee:40:44:e1:b4 brd ff:ff:ff:ff:ff:ff

5: usb0: mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000

    link/ether fa:96:11:12:13:14 brd ff:ff:ff:ff:ff:ff

6: usb1: mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000

    link/ether fa:96:11:12:13:16 brd ff:ff:ff:ff:ff:ff

Only usb0 is used by the LTE modem. usb1 can be ignored.

To add files to a Laird Linux build, enable "BR2_ROOTFS_OVERLAY" in your config and provide it with an absolute path to the directory you would like to overlay.  Files in this directory will be inserted relative to "/".  For example, if you would like to add files to "/etc" and the path to the overlay directory is "/buildroot/overlay", create a directory "/buildroot/overlay/etc/<files>".

Adaptive World Mode should not be used when hosting an AP.  The channel hopping algorithm can cause disconnect issues in some cases.  The best option is to set the regulatory domain in firmware manually, but at the minimum the "adaptive_ww" service should be disabled.  

Laird has added custom packages to Laird Linux.  These can be found in "menuconfig", under the "Ezurio" / "Packages" section.  

To enable a Wi-Fi bridge, select the package "BR2_PACKAGE_LRD_WIFI_BRIDGE" and then set the destination interface. For example, set the destination interface to "Ethernet" if you would like to bridge the Wi-Fi to a wired connection.