EM7455 Gobi drivers install

[jyijyi]

Then what driver is used in MC7455 case in Ubuntu?
BTW, are you using same FW in both modules?

Have you checked this?

MC7455 USB interface for PPP connection

Please note the age of that info. It is currently 5 years old, and has been outdated for some time. And it has always been unsupported by Sierra Wireless for obvious reasons.