The release notes say:
The source code .tar file is available on the Source at: source.sierrawireless.com/resources/airlink/software_downloads/fx30-firmware/fx30-firmware/
However, all that’s available for the CatM is the already built (cwe file) firmware image. The 3G link has download links for the source tarball but there is none for the CatM versions.
Where can I get the firmware distribution source code for my FX30 with R9.1.1.013?