Sierra EM7355 - cannot set modem mode to 4G

[Yevgeny Bar Lev]

Hello,
After managing to get my modem to work. I am able to connect, but the modem
connects to 3G network, while in the same spot and using the same SIM card,
my phone connects to 4G (LTE).

I was trying to set the allowed and preferred modes, by issuing the
following command:

sudo mmcli -m 5 --set-allowed-modes='3G|4G' --set-preferred-mode=4G

but get the following error,

error: couldn't set current modes:
'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Unsupported: Setting
allowed modes not supported'

Is there something I can do about it?
 - ModemManager 1.8.0

Thank you in advance,
Yevgeny.
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