2020-02-27 12:02:01,664 Using board at serial port: /dev/ttyACM0
2020-02-27 12:02:01,666 Sending Application image.
2020-02-27 12:02:05,172 SLIP: --> [9, 1]
2020-02-27 12:02:05,173 SLIP: <-- [96, 9, 1, 1]
2020-02-27 12:02:05,173 Serial: Set Packet Receipt Notification 0
2020-02-27 12:02:05,173 SLIP: --> [2, 0, 0]
2020-02-27 12:02:05,175 SLIP: <-- [96, 2, 1]
2020-02-27 12:02:05,175 SLIP: --> [7]
2020-02-27 12:02:05,177 SLIP: <-- [96, 7, 1, 131, 0]
2020-02-27 12:02:05,177 Sending init packet...
2020-02-27 12:02:05,177 Serial: Selecting Object: type:1
2020-02-27 12:02:05,177 SLIP: --> [6, 1]
2020-02-27 12:02:05,180 SLIP: <-- [96, 6, 1, 0, 1, 0, 0, 13, 0, 0, 0, 229, 217, 61, 62]
2020-02-27 12:02:05,180 Serial: Object selected:  max_size:256 offset:13 crc:1044240869
2020-02-27 12:02:05,180 SLIP: --> [1, 1, 141, 0, 0, 0]
2020-02-27 12:02:05,182 SLIP: <-- [96, 1, 1]
2020-02-27 12:02:05,182 Serial: Streaming Data: len:141 offset:0 crc:0x00000000
2020-02-27 12:02:05,182 SLIP: --> [8, 18, 138, 1, 10, 68, 8, 1, 18, 64, 8, 1, 16, 52, 26, 2, 183, 1, 32, 0, 40, 0, 48, 0, 56, 220, 227, 1, 66, 36, 8, 3, 18, 32, 126, 84, 193, 118, 182, 12, 221, 145, 49, 195, 254, 90, 230, 121, 193, 235, 58, 88, 57, 146, 196, 122, 165, 169, 202, 70, 129, 208, 61, 100, 13]
2020-02-27 12:02:05,182 SLIP: --> [8, 84, 72, 0, 82, 4, 8, 1, 18, 0, 16, 0, 26, 64, 134, 246, 184, 220, 67, 162, 219, 171, 10, 128, 82, 185, 154, 0, 184, 152, 202, 30, 241, 87, 202, 249, 103, 8, 32, 49, 198, 158, 119, 89, 136, 71, 119, 49, 48, 218, 24, 53, 79, 245, 188, 231, 188, 214, 208, 245, 116, 242, 203, 31, 63]
2020-02-27 12:02:05,182 SLIP: --> [8, 152, 38, 82, 9, 78, 187, 176, 216, 154, 104, 181, 86, 250]
2020-02-27 12:02:05,183 SLIP: --> [3]
2020-02-27 12:02:05,184 SLIP: <-- [96, 13, 2]
Traceback (most recent call last):
  File "/home/reddyn/.local/bin/nrfutil", line 8, in <module>
    sys.exit(cli())
  File "/home/reddyn/.local/lib/python2.7/site-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/home/reddyn/.local/lib/python2.7/site-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/home/reddyn/.local/lib/python2.7/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/reddyn/.local/lib/python2.7/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/reddyn/.local/lib/python2.7/site-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/reddyn/.local/lib/python2.7/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/reddyn/.local/lib/python2.7/site-packages/nordicsemi/__main__.py", line 1042, in serial
    timeout)
  File "/home/reddyn/.local/lib/python2.7/site-packages/nordicsemi/__main__.py", line 958, in do_serial
    dfu.dfu_send_images()
  File "/home/reddyn/.local/lib/python2.7/site-packages/nordicsemi/dfu/dfu.py", line 129, in dfu_send_images
    self._dfu_send_image(self.manifest.application)
  File "/home/reddyn/.local/lib/python2.7/site-packages/nordicsemi/dfu/dfu.py", line 97, in _dfu_send_image
    self.dfu_transport.send_init_packet(data)
  File "/home/reddyn/.local/lib/python2.7/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 255, in send_init_packet
    self.__stream_data(data=init_packet)
  File "/home/reddyn/.local/lib/python2.7/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 474, in __stream_data
    response = self.__calculate_checksum()
  File "/home/reddyn/.local/lib/python2.7/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 409, in __calculate_checksum
    response = self.__get_response(DfuTransportSerial.OP_CODE['CalcChecSum'])
  File "/home/reddyn/.local/lib/python2.7/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 492, in __get_response
    + 'Expected: 0x{:02X} Received: 0x{:02X}'.format(operation, resp[1]))
pc_ble_driver_py.exceptions.NordicSemiException: Unexpected Executed OP_CODE.
Expected: 0x03 Received: 0x0D