Purpose is to try building a Zigbee firmware OTA format from wireshark capture.
For now, the main issue seems to the quality of the Capture, as it looks like I'm lacking some packets in the wireshark capture!
Here after is what I came too.
https://github.com/pipiche38/Domoticz-Zigate-Wiki/blob/master/en-eng/Corner_Retreiving-Legrand-Firmware.md