MMBroadbandModemSierraIcera is not a subclass of MMBroadbandModemSierra, so we cannot cast it to that type when passing it to bearer creation. Luckily the bearer doesn't care, so just downgrade the type to MMBroadbandModem.
MMBroadbandModemSierraIcera is not a subclass of MMBroadbandModemSierra, so we cannot cast it to that type when passing it to bearer creation. Luckily the bearer doesn't care, so just downgrade the type to MMBroadbandModem.