Openwrt with EM7455 connecting issue

[Michael pang]

Hello
       I am using OpenWrt 18.06.1 r7258-5eb055306f on linksys AC1900V2
router. EM7455 Generic firmware with M.2 usb enclosure and modemmanager
1.8.2. I followed instruction on your website to compile the package. But I
can't get any connection. I have to issue 3 commands in order to get IP
address(no internet though). Did I do something wrong during the
compiling process? Thank you.

mmcli -e -m 0
mmcli -m 0 --create-bearer="apn=Broadband"
mmcli -c -b 0
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