@tekka
I can now program my board with serial line. It's work perfectly.
It's an issue with my serial converteur and an usb hub. The usb hub add a delay that is not compatible with the bootloader.
Sorry for the question.
Nico
Posts made by Nicolas Charrier
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    RE: MYSBootloader 1.3.0-beta.3posted in Development
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    RE: MYSBootloader 1.3.0-beta.3posted in DevelopmentWith this bootloader, i can not upload scetch with serial or USB. 
 Where does i made a mistake?
 Is there a configuration that is specific to the bootloader?
 Thanks
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    RE: MYSBootloader 1.3 pre-release & MYSController 1.0.0betaposted in DevelopmentHello 
 I succed to program booloader but y can not add my sketch to arduino with serial or USB line.
 Is is activated by default?
 Thanks.