Trying to connect to internet through K5150 usb modem on raspbian buster(last build from raspberry, September).
On windows it is connecting when it is plugged in.
Here is trying to connect but not receiving tx and it is the stand by icon: ↑↓ one arrow blue, one arrow grey.
When tried manual:
sudo ip link set wwan0 down
sudo ip link set wwan0 up sleep 65 ifconfig wwan0 route -n
wwan0: flags=4291<UP,BROADCAST,RUNNING,NOARP,MULTICAST> ... RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 37 bytes 7004 (6.8 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface