Swiflash failed on restoring FX30

Hi,

i tried to restore the firmware of a FX30. The swiflash tool fails every time with Firmware Download Failed.
See the log:

**swiflash -m fx30_wp85 -i ./mcu-rmfw-boot-yocto-legato_wp85.cwe **
Detecting USB of the target
DONE
Communicating with the target
.DONE
Downloading the firmware
…ERROR: Firmware Download failed. Callback status 59399ERROR: Firmware Download Failed
DONE

Just restoring fails too:

swiflash -m fx30_wp85 -r
Detecting USB of the target
DONE
Communicating with the target
.DONE
Downloading the firmware
…ERROR: Firmware Download failed. Callback status 59399ERROR: Firmware Download Failed
DONE

What does the callback status 59399 mean ? What i am doing wrong ?

Saleh