The NB-IoT Unit Global (SIM7020G) has firmware 1910B03SIM7020G and there are some functions that are not working, but are working on the Atom DTU NB-IoT Kit Global (SIM7020G) which has firmware 1910B06SIM7020G.

Does anyone know the process to update the firmware?

I have contacted SIMCOM support, and they have sent me a tool, and the latest firmware 1910B08SIM7020G, but I can't get the update working, or know what I am supposed to do.

I have tried connecting the NB-IoT Unit directly to my computer, using a USB-Serial converter, wired direct to TX/RX (and GND).

The converter only has 3.3V, so I also have an external 5V supply.

When it is all connected, I can use a terminal program to directly connect to the modem, and send AT commands.

However I try running their update software and it can't connect.

Does anyone know the correct procedure?

Thanks.