EM7411 is enumerating ttyUSB0 alone instead of ttyUSB0, ttyUSB1 & ttyUSB2. Also observed that Product ID got changed to 9090. In working scenario, it was 9091. Not sure how got changed. How to change this product id to 9091?
In Non-working scenario:
[ 68.248800] usb 1-1: new high-speed USB device number 2 using rockchip_ehci_host
[ 68.399534] usb 1-1: New USB device found, idVendor=1199, idProduct=9090
[ 68.406430] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 68.413586] usb 1-1: Product: Sierra Wireless EM7411 Qualcomm® Snapdragon� X16 LTE-A
[ 68.422127] usb 1-1: Manufacturer: Sierra Wireless, Incorporated
[ 68.428274] usb 1-1: SerialNumber: 8F5024999303B131
[ 68.444476] GobiSerial 1-1:1.0: GobiSerial converter detected
[ 68.457781] usb 1-1: GobiSerial converter now attached to ttyUSB0
It is stuck in download mode, you might need to download firmware to it