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Cr10s can't update marlin

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Hello,

I tried to update my printer (CR10S) from Marlin 1.1.9 to 2.1.x with octoprint (from usb) and the firmware updater.
But I can't do it, it keep to fail when verifying the memory.
The log shows:

avrdude: reading on-chip flash data:

avrdude: verifying ...

avrdude: verification error, first mismatch at byte 0x0002

0xda != 0x42

avrdude: verification error; content mismatch

avrdude done. Thank you.

Did anyone have encountered this error ? I have scroll all website i could find but can't find a solution.

Have a great day !