Hello, I've just received SimTrace2, LED green and red are flashing. Even phone is able to connect to telecom network. However, connecting to USB on Ubuntu 21.10 does not work (also tried with Ubuntu 20.04.3 LTS). No /dev/ttyUSB*, or /dev/ttyACM* appears. Here are dmesg: [ 4513.939503] usb 1-4.1: USB disconnect, device number 26 [ 4514.931801] usb 1-4.1: new full-speed USB device number 27 using xhci_hcd [ 4515.036480] usb 1-4.1: New USB device found, idVendor=1d50, idProduct=60e3, bcdDevice= 0.02 [ 4515.036494] usb 1-4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=11 [ 4515.036501] usb 1-4.1: Product: SIMtrace 2 [ 4515.036505] usb 1-4.1: Manufacturer: sysmocom - s.f.m.c. GmbH [ 4515.036509] usb 1-4.1: SerialNumber: xxxxxxx I've followed these instructions: https://osmocom.org/projects/simtrace2/wiki - have my user id plugdev group (logged out to verify), - verified that udevs are right and service has been restarted. https://git.osmocom.org/simtrace2/plain/host/contrib/99-simtrace2.rules - here is the list of libusb: libgusb2:amd640.3.5-1build1 libusb-0.1-4:amd642:0.1.12-32build2 libusb-1.0-0:amd642:1.0.24-3 libusb-1.0-0-dev:amd642:1.0.24-3 libusb-1.0-doc2:1.0.24-3 libusb-dev2:0.1.12-32build2 libusbmuxd6:amd642.0.2-3build1 and libosmo* libosmocodec0:amd641.4.2-3 libosmocoding0:amd641.4.2-3 libosmocore-dev:amd641.4.2-3 libosmocore16:amd641.4.2-3 libosmoctrl0:amd641.4.2-3 libosmogb11:amd641.4.2-3 libosmogsm15:amd641.4.2-3 libosmosim2:amd641.4.2-3 libosmovty4:amd641.4.2-3 Also I've tried to flash the latest firmware like in this document, with the "simtrace-trace-dfu-latest.bin" from 2022-Jan-25 07:52:30 https://osmocom.org/projects/simtrace2/wiki/Flashing#DFU Please advise where is the problem Thanks -- Sabr