nrtutil error in __set_prn on RaspberryPi OS and nRF52840 Dongle

Question

I try to DFU on RaspberryPi OS by usb-serial. I put nRF52840 dongle on USB port of RPI4. And press reset button of the dongle. 
 I got error on nrftuil. 
 
 $ nrfutil dfu usb-serial -pkg ~/nordic/nRF5_SDK_17.1.0_ddde560/examples/dfu/secure_dfu_test_images/ble/nrf52840/hrs_application_s140.zip -p /dev/ttyACM0 -b 115200 
 Traceback (most recent call last): 
 File "/home/pi/.local/bin/nrfutil", line 8, in <module> 
 sys.exit(cli()) 
 File "/home/pi/.local/lib/python3.7/site-packages/click/core.py", line 829, in __call__ 
 return self.main(*args, **kwargs) 
 File "/home/pi/.local/lib/python3.7/site-packages/click/core.py", line 782, in main 
 rv = self.invoke(ctx) 
 File "/home/pi/.local/lib/python3.7/site-packages/click/core.py", line 1259, in invoke 
 return _process_result(sub_ctx.command.invoke(sub_ctx)) 
 File "/home/pi/.local/lib/python3.7/site-packages/click/core.py", line 1259, in invoke 
 return _process_result(sub_ctx.command.invoke(sub_ctx)) 
 File "/home/pi/.local/lib/python3.7/site-packages/click/core.py", line 1066, in invoke 
 return ctx.invoke(self.callback, **ctx.params) 
 File "/home/pi/.local/lib/python3.7/site-packages/click/core.py", line 610, in invoke 
 return callback(*args, **kwargs) 
 File "/home/pi/.local/lib/python3.7/site-packages/nordicsemi/__main__.py", line 1001, in usb_serial 
 timeout) 
 File "/home/pi/.local/lib/python3.7/site-packages/nordicsemi/__main__.py", line 956, in do_serial 
 dfu.dfu_send_images() 
 File "/home/pi/.local/lib/python3.7/site-packages/nordicsemi/dfu/dfu.py", line 129, in dfu_send_images 
 self._dfu_send_image(self.manifest.application) 
 File "/home/pi/.local/lib/python3.7/site-packages/nordicsemi/dfu/dfu.py", line 90, in _dfu_send_image 
 self.dfu_transport.open() 
 File "/home/pi/.local/lib/python3.7/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 216, in open 
 self.__set_prn() 
 File "/home/pi/.local/lib/python3.7/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 359, in __set_prn 
 + map(ord, struct.pack('<H', self.prn))) 
 TypeError: can only concatenate list (not "map") to list

tni · Accepted Answer

By installing pip, v5.2 is installed. I get v6.1.3 from git and replaced. Then nrfutil works on RPI4. 
 I run these command for updating nordicsemi python lib. 
 $ cd ~ 
 $ git clone https://github.com/NordicSemiconductor/pc-nrfutil.git 
 $ cd /home/pi/.local/lib/python3.7/site-packages/ 
 $ mv nordicsemi nordicsemi.5.2 
 $ cd ~/pc-nrfutil 
 $ cp -r nordicsemi /home/pi/.local/lib/python3.7/site-packages/.