The modem firmware on the MKRNB1500 I bought was a bit outdated and I unsuccessfully tried to flash to a new version via the AT command pass through.
Thanks to Arduino being open source hardware and schematics & PCB files being available, I was able to find the PCB connector point to wire a standard USB cable directly to the SARA-R410M-02B modem.
This allow me to use u-Blox EasyFlash for the firmware update.
Attached is how to wire it. Simply cut a standard USB 2.0 cable and solder the wires to the pads indicated. They are very small, but adding a tiny bit of solder on them makes it easier. Less heat is more...
USB is basically only +5V, GND, D- and D+.
The other point to solder is a bridge between to existing points on the PCB. I use one end of a wire to make it easier. This bridge enables the USB mode of the modem.
When all soldering was done right, simply connect the USB cable to your PC. I used a Windows 10 PC. All needed drivers were available on Windows Update.
Hope this helps others.
-Sven
