ubuntu 22.04 can not transfer the UF2 zip file into the USB drive

[Teymurian]

Ubuntu 22.04 can not transfer the UF2 zip file into the USB drive. after pushing the reset button and connecting it to the USB port, then trying to copy the uf2 file it shows this error PermissionError: [Errno 13] Permission denied: '/dev/ttyACM0' which is fixed by sudo chmod 666 /dev/ttyACM0 next try can't finish the copy process and this is the error:

nrfutil pkg generate --hw-version 52 --sd-req 0x00 --application-version 1 --application ~/Downloads/adafruit-circuitpython-makerdiary_nrf52840_mdk_usb_dongle-en_US-7.3.2.hex app_dfu_pkg_test2.zip |===============================================================| |You are not providing a signature key, which means the DFU | |files will not be signed, and are vulnerable to tampering. | |This is only compatible with a signature-less bootloader and is| |not suitable for production environments. | |===============================================================| Zip created at app_dfu_pkg_test2.zip sudo chmod 666 /dev/ttyACM0 sudo ls -l /dev/ttyACM0 crw-rw-rw- 1 root dialout 166, 0 Aug 29 00:10 /dev/ttyACM0

nrfutil dfu usb-serial -pkg app_dfu_pkg_test2.zip -p /dev/ttyACM0 [------------------------------------] 0%2022-08-29 00:11:36,459 LIBUSB_ERROR_ACCESS: Unable to connect to trigger interface.

Traceback (most recent call last): File "/home/ed/.local/bin/nrfutil", line 8, in sys.exit(cli()) File "/usr/lib/python3/dist-packages/click/core.py", line 1128, in call return self.main(args, kwargs) File "/usr/lib/python3/dist-packages/click/core.py", line 1053, in main rv = self.invoke(ctx) File "/usr/lib/python3/dist-packages/click/core.py", line 1659, in invoke return _process_result(sub_ctx.command.invoke(sub_ctx)) File "/usr/lib/python3/dist-packages/click/core.py", line 1659, in invoke return _process_result(sub_ctx.command.invoke(sub_ctx)) File "/usr/lib/python3/dist-packages/click/core.py", line 1395, in invoke return ctx.invoke(self.callback, ctx.params) File "/usr/lib/python3/dist-packages/click/core.py", line 754, in invoke return __callback(args, **kwargs) File "/home/ed/.local/lib/python3.10/site-packages/nordicsemi/main.py", line 1032, in usb_serial do_serial(package, port, connect_delay, flow_control, packet_receipt_notification, baud_rate, serial_number, False, File "/home/ed/.local/lib/python3.10/site-packages/nordicsemi/main.py", line 988, in do_serial dfu.dfu_send_images() File "/home/ed/.local/lib/python3.10/site-packages/nordicsemi/dfu/dfu.py", line 127, in dfu_send_images self._dfu_send_image(self.manifest.application) File "/home/ed/.local/lib/python3.10/site-packages/nordicsemi/dfu/dfu.py", line 88, in _dfu_send_image self.dfu_transport.open() File "/home/ed/.local/lib/python3.10/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 217, in open self.__get_mtu() File "/home/ed/.local/lib/python3.10/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 366, in __get_mtu self.mtu = struct.unpack('<H', bytearray(response))[0] TypeError: cannot convert 'NoneType' object to bytearray

could you help me with this?

[AndrewBarfield]

This is a long shot... but any update on this?

[caizelin]

@AndrewBarfield Could you try the latest UF2 Bootloader 0.7.1

[jstothr]

Did you find a solution?