Thnks… i don’t now the repository
I compared the versions of .h configuration file (with that of Cura 2) … there are no difference.
But I did a test: open the hex file (Cura 2) Arduino and send in Ultimaker it is downloaded but the printer stops working. While the same file sent via Cura 2 makes it work.
I think that sends or compilation (in hex file) Arduino modified the file and makes it unreadable by Ultimaker
Moreover, the weight of the hex file created by Arduino is heavier than the hex file Cura 2