C:\Users\35273>nrfutil --verbose dfu serial -pkg  C:/Users/35273/dfu_test.zip -p com6 -b 115200  --mesh
Upgrading target on com6 with DFU package C:\Users\35273\dfu_test.zip. Flow control is disabled.
Flushing com-port...
Opened com-port
Starting DFU upgrade of type 4, SoftDevice size: 0, bootloader size: 0, application size: 130272
Sending DFU start packet, afterwards we wait for the flash on target to be initialized before continuing.
PC -> target: 0502aabbccdd
target -> PC: 0582aabbccdd
Got echo response
Sending DFU init packet
PC -> target: 1378fdff040fd684dc4e5900000001000b000000
target -> PC: 16a6045900000001000b00000059000000010009000000
target -> PC: 03847800
PC -> target: 1378fdff040fd684dc4e5900000001000b000000
target -> PC: 03847800
PC -> target: 1478fcff0000d684dc4effffffff387f000040000c
target -> PC: 0da201045900000001000b000000
target -> PC: 03847800
Sending firmware file
  [------------------------------------]    1%  00:11:56PC -> target: 1978fcff0100d684dc4e00f0002071630200596302005b630200
target -> PC: 03847800
PC -> target: 1978fcff0200d684dc4e5d6302005f6302006163020000000000
.....
PC -> target: 1978fcff2400d684dc4e3149324a00f03ef831483249324a00f0
target -> PC: 03847800
PC -> target: 1978fcff2500d684dc4e39f832483249334a00f034f832483349
target -> PC: 03847800
PC -> target: 1978fcff2600d684dc4e334a00f02ff833483349344a00f02af8
PC -> target: 1978fcff2600d684dc4e334a00f02ff833483349344a00f02af8
target -> PC: 03847887
PC -> target: 1978fcff2600d684dc4e334a00f02ff833483349344a00f02af8
PC -> target: 1978fcff2600d684dc4e334a00f02ff833483349344a00f02af8
target -> PC: 03844a82
PC -> target: 1978fcff2600d684dc4e334a00f02ff833483349344a00f02af8


Failed to upgrade target. Error is: Device returned status code ERROR_INVALID_DATA (135) on a DFU data packet.

Possible causes:
- bootloader, SoftDevice or application on target does not match the requirements in the DFU package.
- baud rate or flow control is not the same as in the target bootloader.
- target is not in DFU mode. If using the SDK examples, press Button 4 and RESET and release both to enter DFU mode.
Closing serial port...