Hi Rafael, thank you for your help. It was my mistake with the serial number example. The number appearing in the error is the same one that I try to set. The probes I got are pretty new (at least I've them since a couple of weeks). Besides in my error message there's no suggestion to update the boot loader as in your. I guess it is something different. I don't know if there's a way to check the boot laoder version though. Thank you again. Valentina
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