Cannot convert Linganzh LWE3

**Did you have issues getting a device to flash?**
Hello, I am trying to convert my Linganzh LWE3 light bulb (https://templates.blakadder.com/LWE3.html), but I am failing at it with the "device did not appear with the intermediate firmware" message.
I see in the smarthack-web.log logfile that the light is communicating with tuya-convert, but the intermediate firmware is not sent to the device.

Can you please help me ?

**logs**!
```
root@kali:~/tuya-convert# ./start_flash.sh
tuya-convert v2.4.3
======================================================
TUYA-CONVERT

https://github.com/ct-Open-Source/tuya-convert
TUYA-CONVERT was developed by Michael Steigerwald from the IT security company VTRUST (https://www.vtrust.de/) in collaboration with the techjournalists Merlin Schumacher, Pina Merkert, Andrijan Moecker and Jan Mahn at c't Magazine. (https://www.ct.de/)

======================================================
PLEASE READ THIS CAREFULLY!
======================================================
TUYA-CONVERT creates a fake update server environment for ESP8266/85 based tuya devices. It enables you to backup your devices firmware and upload an alternative one (e.g. ESPEasy, Tasmota, Espurna) without the need to open the device and solder a serial connection (OTA, Over-the-air).
Please make sure that you understand the consequences of flashing an alternative firmware, since you might lose functionality!

Flashing an alternative firmware can cause unexpected device behavior and/or render the device unusable. Be aware that you do use this software at YOUR OWN RISK! Please acknowledge that VTRUST and c't Magazine (or Heise Medien GmbH & Co. KG) CAN NOT be held accountable for ANY DAMAGE or LOSS OF FUNCTIONALITY by typing yes + Enter

yes
Checking for network interface wlan0... Found.
Checking UDP port 53... Available.
Checking UDP port 67... Available.
Checking TCP port 80... Available.
Checking TCP port 443... Available.
Checking UDP port 6666... Available.
Checking UDP port 6667... Available.
Checking TCP port 1883... Available.
Checking TCP port 8886... Available.
sudo: ufw: command not found
======================================================
Starting AP in a screen.
Starting web server in a screen
Starting Mosquitto in a screen
Starting PSK frontend in a screen
Starting Tuya Discovery in a screen

======================================================

IMPORTANT
1. Connect any other device (a smartphone or something) to the WIFI vtrust-flash
This step is IMPORTANT otherwise the smartconfig may not work!
2. Put your IoT device in autoconfig/smartconfig/pairing mode (LED will blink fast). This is usually done by pressing and holding the primary button of the device
Make sure nothing else is plugged into your IoT device while attempting to flash.
3. Press ENTER to continue

======================================================
Starting smart config pairing procedure
Waiting for the device to install the intermediate firmware
Put device in EZ config mode (blinking fast)
Sending SSID vtrust-flash
Sending wifiPassword
Sending token 00000000
Sending secret 0101
................
SmartConfig complete.
Resending SmartConfig Packets
..............................................................................................................
Device did not appear with the intermediate firmware
Check the *.log files in the scripts folder
Do you want to try flashing another device? [y/N] n
======================================================
Cleaning up...
Closing AP
Exiting...

```

[smarthack-mqtt.log](https://github.com/ct-Open-Source/tuya-convert/files/4271479/smarthack-mqtt.log)
[smarthack-psk.log](https://github.com/ct-Open-Source/tuya-convert/files/4271480/smarthack-psk.log)
[smarthack-udp.log](https://github.com/ct-Open-Source/tuya-convert/files/4271481/smarthack-udp.log)
[smarthack-web.log](https://github.com/ct-Open-Source/tuya-convert/files/4271482/smarthack-web.log)
[smarthack-wifi.log](https://github.com/ct-Open-Source/tuya-convert/files/4271483/smarthack-wifi.log)