Hi
Thank you for your quick answer.
With DEBUG flag I now see the MD5 .
I think the problem is from the server program painlessmeshboost.
For the first version of the firmware : Everything was OK only ONE single download.
Then I have remove the initial version from ota-dir
copy a new version of the program
Now the problem
It seems that the server is announcing both version of the firmware.
The result is the ESP8266 receive initial version
and then new version
and back to initial version.
If I stop the server program this will stop.
This work around cause me another problem, from the server side I do not see
OTA activity with remote node.
I have attached my logfile.
Thanks for your help