Hi openwrt my router can’t access the module. can’t access device /dev/ttyUSB2. the action i take to reflash/reinstall the openwrt firmware. But still have same error can’t access device.
The original protocol is QMI but i switch to MBIM and unable to revert to QMI and my 5G module keep disconnect and connect in system.
log
found RM520N-GL have no
switch data file.
can’t access device.
is there any solution to fix this 5G module? it keeps connect and disconnect on modem router
I believe I’ve had this same issue, the fix is to use ttyusb3 to connect to run AT commands - you can also map the ports for different functions, I know I had to set ttyusb2 and ttyusb3 - I was running the Goldenorb/Rooter fork - there is a large post you can search on whirlpool . net . au
Any direct reference to ttyUSBx is potentially wrong.
This modem has its AT command port on USB If#= 2 and you need to check which tty device this interface is mapped to.
I am also using openwrt on wg1608 with rm520. Try tty on USB3. Return it back to qmi mode. If that doesn’t work better use usb adapter plug it to pc and use quectel software to return it to qmi.
Mbim doesn’t improve speed at all plus it isn’t stable. It is by using software and hardware offloading that you’ll notice speed improvement with openwrt.
You don’t need an adapter or putty.
Install (if not installed already) picocom or any other terminal app in OpenWrt and access your modem as picocom /dev/ttyUSB2
Then type the AT commands you need.