Hi,
The solution to this is to update your modem firmware manually through CLI. I will need your current modem firmware versions so I could provide you with the new ones and simple instructions.
If you're still facing this issue with lost mobile connectivity after a failed modem update, please send me your current modem firmware version number in the private messages.
We're truly sorry that you're experiencing this kind of issue, it will be fixed with a new firmware version.
Thank you for your patience.
EB.