OpenWrt Forum Archive
https://forum.archive.openwrt.org/viewtopic.php?id=7201305.03.2018 · I had contact with quectel some time ago (via provider of router) and got the info, they do not support qmi mode. As I also did not succeed to use the quectel on my router in serial mode, we dropped it and switched back to Huawei. You might try to get in touch with quectel directly for an update.