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E6320: trouble with Sierra installer


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Sorry for my bad English, I'm french. I have an E6320 i5 intel 3000HD

I have make my USB key with the how to for Mavericks. All work fine. But With "El Capitan" or 3 sierra I have problem during the process installation :


With El capitan the computer reboot a the beginning of the installation process.

With sierra the computer reboot a the end or show me this error : "the installer payload failed signature check"


I try to make a lot of USB key with different Sierra install app / DMG and utility. I try an other usb port. I try to update date with ntpdate -u time.apple.com. I tri with an other E6320 computer a have the same problems...


I don't have any idea.


Thank you very much for your help  :mrgreen:

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