Hi this is Rick: 2023

Download OpenWRT images (squashfs-combined.img) from https://downloads.openwrt.org/releases/
De-compress by using, "gzip -d <openwrt-xxx-img.gz>"
Upload to PVE as iso image
Follow this page for creating an OpenWRT VM, https://optimus-xs.github.io/posts/install-openwrt-in-pve/
On PVE web UI, add a network interface for temporary WAN access
On OpenWRT web UI, update software list
Install quem-ga so that network info can be shown on PVE web UI
On PVE UI, add LTE dongle to OpenWRT VM
On OpenWRT, install usbutis for lsusb.
opkg install usbutils
On OpenWRT, install minicom.
opkg install minicom
On OpenWRT, install following packages for Huawei LTD dongle
opkg install comgt-ncm kmod-usb-net-huawei-cdc-ncm usb-modeswitch
Check there are ttyUSBx device nodes
Follow this page to connect to mobile network, https://techship.com/faq/how-to-activate-the-data-connection-for-huawei-cellular-usb-sticks-ms2372-series-using-the-ncm-network-interface-in-linux/
On openWRT UI, add a new WAN interface by selecting device as "wwan0" and protocol as "dhcp"

Hi this is Rick