Hi @mpeirone ,
You can install the Melody DFU tool to upgrade the firmware by following the link below:
https://source.sierrawireless.com/resources/airprime/software/bc127-firmware-upgrade-tool/#sthash.lIerq4Vg.dpbs
You can use 1 of 2 functions “Download” or “Recover” in this tool.
Also you can refer to this topic: BC127 Failed FW Upgrade
Thanks,