stm32flash files

Where I can find the files to update the ST32 firmware of the MKRWAN1300?

There's an example inside the MKRWAN library FWUpdaterBridge that flashes the fw from the stm32 controller inside the Murata radio module. In order to update files you need the stm32flash, but I'm not able to find these files... Is there any way to find the factory file (with the firmware you uploaded from factory)?

Kind regards.

SOLVED! used to MKRWANUpdater_standalone