This error occurred when running the firmware!

[chinahuhonglue]

sudo ./fat.py ../../DIR-605LBx_FW209UIb02.bin

                           __           _
                          / _|         | |
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                         | |   | (_| | | |_
                         |_|    \__,_|  \__|

            Welcome to the Firmware Analysis Toolkit - v0.3
Offensive IoT Exploitation Training http://bit.do/offensiveiotexploitation
              By Attify - https://attify.com  | @attifyme

[+] Firmware: DIR-605LBx_FW209UIb02.bin
[+] Extracting the firmware...
[+] Image ID: 1
[+] Identifying architecture...
[+] Architecture: mipseb
[+] Building QEMU disk image...
[+] Setting up the network connection, please standby...
Traceback (most recent call last):
File "./fat.py", line 172, in
main()
File "./fat.py", line 167, in main
infer_network(arch, image_id, qemu_dir)
File "./fat.py", line 113, in infer_network
child.expect_exact("Interfaces:", timeout=None)
File "/home/china/.local/lib/python3.8/site-packages/pexpect/spawnbase.py", line 421, in expect_exact
return exp.expect_loop(timeout)
File "/home/china/.local/lib/python3.8/site-packages/pexpect/expect.py", line 179, in expect_loop
return self.eof(e)
File "/home/china/.local/lib/python3.8/site-packages/pexpect/expect.py", line 122, in eof
raise exc
pexpect.exceptions.EOF: End Of File (EOF). Exception style platform.
<pexpect.pty_spawn.spawn object at 0x7f9a915d6490>
command: /home/china/文档/firmware-analysis-toolkit-master/firmadyne/scripts/inferNetwork.sh
args: ['/home/china/文档/firmware-analysis-toolkit-master/firmadyne/scripts/inferNetwork.sh', '1', 'mipseb']
buffer (last 100 chars): b''
before (last 100 chars): b"\x96\x87\xe6\xa1\xa3/firmware-analysis-toolkit-master/firmadyne/scratch//1//image.raw': No such file or directory\r\n"
after: <class 'pexpect.exceptions.EOF'>
match: None
match_index: None
exitstatus: None
flag_eof: True
pid: 22673
child_fd: 5
closed: False
timeout: 30
delimiter: <class 'pexpect.exceptions.EOF'>
logfile: None
logfile_read: None
logfile_send: None
maxread: 2000
ignorecase: False
searchwindowsize: None
delaybeforesend: 0.05
delayafterclose: 0.1
delayafterterminate: 0.1
searcher: searcher_string:
0: b'Interfaces:'

[chinahuhonglue]

firmware ： DIR-605LBx_FW209UIb02.zip

[Loora1N]

maybe you can try sudo ./fat.py ../../DIR-605LBx_FW209UIb02.bin --qemu 2.5.0.

[Kusekushi]

So the issue here is that pexpect doesn't support cjk characters - aka any other character than latin ones.
Please try again without using any chinese characters in the path.