OpenWrt with FM190W-GL module - cannot detect SIM

Installing and Using OpenWrt Network and Wireless Configuration
14

My understanding that simX corresponds to M.2 slot X.
So, if the modem is in slot 1, you need to toggle GPIO called sim1.
If you have a router running OEM or any other firmware where the modem works, it is worth checking the current GPIO state with cat /sys/kernel/debug/gpio.

Then once you back to the official OpenWrt, to toggle the named GPIO like sim1 you need to run

echo 1 > /sys/class/gpio/sim1/value
 or
echo 0 > /sys/class/gpio/sim1/value

You will need to reset the modem after the SIM switching, not reboot the router!

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