Fwupdate doesn't work on FX30-catm

I’m trying to update an fx30-catm (wp7702) from the default generic fw (available on the site) to the sierra firmware. Unfortunately, the fwupdate doesn’t work…
Here is the step I use:

  • Flash a default fw with swiflash (from developer studio)
  • scp an another default fw (or a custom fw it doesn’t make any difference)
  • fwupdate download the new fw
  • The box reboot
  • When the reboot is finished, the running fw is still the old one (no error in fwupdate checkStatus or in console)

I already open a topic on the legato forum (Legato Forum fwpdate)

Best regards,