Upgrade to Legato 16.07 AR7

Hi daav, thank you for your hint, it works and finally I have been able to upgrade to legato 16.01 the board.
I report here the steps I have done, maybe it will be usefull for other users.
For first thing I gave the command:

swiflash -m AR755X -r

I tried so to use the upgrade command through the ethernet interface but:

$ update build/ar7/system.ar7.update 192.168.0.102
Applying update from file 'build/ar7/system.ar7.update' to device at address '192.168.0.102'.
sh: /legato/systems/current/bin/update: not found
Update failed
sh: /legato/systems/current/bin/legato: not found

So I tried again the swiflash tool in this manner:

$ cd ~/legato/packages/legato.device.image.7.10.8.00.2-ar7-201606291510/resources/ar755
$ swiflash -m AR755X -i spkg-boot-modemz-yoctoz-legatoz.cwe 
Detecting USB of the target
DONE
Communicating with the target
DONE
Switching to firmware download mode
.........DONE
Downloading the firmware
..................DONE
Rebooting the module
.......DONE
Firmware Download SUCCESS

And it worked.
Rebooting the board:

root@swi-mdm9x15:~# legato version
16.01.5.m1_e343aba3b03895aa39f2d473f079b1ec

So finally the board was upgraded.
To solve the problem that the usb was not recognized as network interface it was sufficien do:

# cd /etc/legato/
# cp usbmode.ex usbmode
# reboot

Here other information on how customize the usb interface: legato.io/legato-docs/latest/how … zeUSB.html .
Thank you to all of you for your help.
Giorgio