Hi
@francisfatade
Not sure what is happening there but because you have Masso running with software on it already you can use that to check that you can see the USB flash drive.
This the new upgrade software on the USB drive just add a small Gcode file to root directory as well.
When you turn on masso and plug in the usb drive you should see USB on the bottom line and you should be able to see your Gcode file on the drive.
If you can see the Gcode file then Masso is able to read the drive. Repower Masso and it should load the new update.
Personally I just use the same USB flashdrive for updates and my GCode and never remove the Gcode files on it and I change software several times a week without issue.
I don't know if this will help but see how you go.
Regards
Peter