Help with D-Link DWR 921 c3

First of all. I'm new here is the first time I use a firmware of OpenWrt. I installed the last update on a D-Link WRT 921 c3. It's an LTE router. But now I can configure the mobile connection. Right now I have a huge headache. So, please. Any help will be well received. Thank

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Specifically: https://openwrt.org/toh/d-link/dwr-921#g3g_modem

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