Morning,
Since batch at least 113 Teltonika RUT955 is shipped with a new, to my understanding not supported LTE modem: Quectel EC25-EU.
The other devices I have is from batch 107 and is shipped with Quectel EG25-G and works just fine.
The modem hardware replacement are currently breaking problems for the large amount of devices >100 we ordered. I've tested this on 21.02.03 and with any WWAN driver I can think of.
The modem works on stock firmware from Teltonika but we cannot use that one.
https://wiki.teltonika-networks.com/view/RUT955_Firmware_Downloads
EC25-EU on OpenWRT 21.02.03
root@OpenWRT-RUT955:~# dmesg
[ 17.306552] qmi_wwan 1-1.4:1.4: cdc-wdm0: USB WDM device
[ 17.323300] qmi_wwan 1-1.4:1.4 wwan0: register 'qmi_wwan' at usb-1b000000.usb-1.4, WWAN/QMI device, 92:14:1c:8a:86:5f
[ 17.334401] usbcore: registered new interface driver qmi_wwan
[ 17.616697] usbcore: registered new interface driver option
[ 17.622530] usbserial: USB Serial support registered for GSM modem (1-port)
[ 17.630586] option 1-1.4:1.0: GSM modem (1-port) converter detected
[ 17.637326] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB0
[ 17.644882] option 1-1.4:1.1: GSM modem (1-port) converter detected
[ 17.651649] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB1
[ 17.659190] option 1-1.4:1.2: GSM modem (1-port) converter detected
[ 17.665947] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB2
[ 17.673486] option 1-1.4:1.3: GSM modem (1-port) converter detected
[ 17.680257] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB3
EC25-EU on stock firmware
root@Teltonika-RUT955:~# dmesg
[ 21.840000] usb 1-1.4: new high-speed USB device number 4 using ehci-platform
[ 21.960000] option 1-1.4:1.0: GSM modem (1-port) converter detected
[ 21.960000] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB0
[ 21.970000] option 1-1.4:1.1: GSM modem (1-port) converter detected
[ 21.980000] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB1
[ 21.990000] option 1-1.4:1.2: GSM modem (1-port) converter detected
[ 21.990000] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB2
[ 22.000000] option 1-1.4:1.3: GSM modem (1-port) converter detected
[ 22.010000] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB3
[ 22.090000] qmi_wwan 1-1.4:1.4: cdc-wdm0: USB WDM device
[ 22.090000] qmi_wwan 1-1.4:1.4: Quectel EC21&EC25&EC20 R2.0 work on RawIP mode
[ 22.100000] qmi_wwan 1-1.4:1.4 wwan0: register 'qmi_wwan' at usb-ehci-platform-1.4, WWAN/QMI device, 06:a2:de:3c:16:a5
Any pointers? Suggestions on how to attack the problem?