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Could you please tell me if there is a document describing the protocol for downloading the program into the CH552?
Is this possible only via USB or is it possible through a com-port?
I contacted the manufacturer, but they, to my great surprise, replied that this information was not published.
I am somewhat confused - usually manufacturers do not hide such information. I do not see any risks for the manufacturer in disseminating this information.
Thank you for your reply.