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When you get the message “Cannot satisfy the following dependencies for…” it is most likely because you installed a snapshot version of OpenWrt.
Read here for possible solutions.
It is probably running a manufacturer's build now. When you switch to an official build from openwrt.org it comes with only basic routing packages-- you will need to install modem drivers separately. It would be a good idea to read the log from the running firmware to see which drivers the installed modem uses. Also you'll need a different way to temporarily connect the router to the Internet for driver download.