simtrace2 flash firmware images issue

Hi community: when i try to flash firmware images from https://ftp.osmocom.org/binaries/simtrace2/firmware/latest/simtrace-dfu-fla… simtrace2-sniff doesn't work. sudo bossac --port=/dev/ttyACM0 --usb-port=1 --erase --verify --boot=1 --write simtrace-dfu-flash-latest.bin Erase flash Done in 0.013 seconds Write 15880 bytes to flash (63 pages) [==============================] 100% (63/63 pages) Done in 0.604 seconds Verify 15880 bytes of flash [==============================] 100% (63/63 pages) Verify successful Done in 0.474 seconds Set boot flash true $ lsusb Bus 003 Device 030: ID 1d50:60e3 OpenMoko, Inc. $sudo ./simtrace2-list USB matches: 1 1d50:60e3 Addr=30, Path=3-2, Cfg=2, Intf=0, Alt=0: 255/255/0 (0.7.0.60-859f) $ sudo ./simtrace2-sniff simtrace2-sniff - Phone-SIM card communication sniffer (C) 2010-2017 by Harald Welte <laforge(a)gnumonks.org> (C) 2018 by Kevin Redon <kredon(a)sysmocom.de> No compatible USB devices found: Resource temporarily unavailable sudo dfu-util --list dfu-util 0.8 Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc. Copyright 2010-2014 Tormod Volden and Stefan Schmidt This program is Free Software and has ABSOLUTELY NO WARRANTY Please report bugs to dfu-util(a)lists.gnumonks.org Found DFU: [1d50:60e3] ver=0000, devnum=30, cfg=1, intf=0, alt=2, name="not available", serial="51203120395134503230333139303033" Found DFU: [1d50:60e3] ver=0000, devnum=30, cfg=1, intf=0, alt=1, name="Flash (Application Partition)", serial="51203120395134503230333139303033" Found DFU: [1d50:60e3] ver=0000, devnum=30, cfg=1, intf=0, alt=0, name="RAM", serial="51203120395134503230333139303033" What should I do?