How to upgrade BG77 over USB

Hello

I’m already able to make a DFOTA upgrade over LTE but we have started a production, and all our devices came with version 004. If i make the DFOTA, it will consume a lot of data, so that’s why I wanted to improve my test bench to be able to make the upgrade over the USB.

Is there a procedure or simple scripts that could help me to start ? I coudn’t find anything.

THank you in advance,

Best regards,

Aurélien