updating firmware LAIRD RM186 :
connect your RM186 adapterboard with usb serial ( I used this one but others will do )
after soldering and wiring check with the terminal program if you can communicate with the module and check the current firmware.
attention switch the usb serial converter to 3V3 logic and make sure that the Vcc of the module is 3v3 !
so don't feed it direct from your PC
now check communication from within the terminal program:
AT I 3
the module answers with the firmware version, here 22.214.171.124
create an account (free) at the LAIRD site where you can check for the latest firmware, download the zip file.
inside you'll find RM1xxUartFwUpgrade.exe the tool to upload the new firmware, which is alsoo included.
at this moment 126.96.36.199
now start this tool.. and point to the new firmware image
finally start your terminal again
and you're up to date