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CC3220MOD: Error: Create Basic OTA Error:Wrong key file

Part Number: CC3220MOD

Hey,

I've been reading about this on the forum but I still don't understand how to create the OTA image. When prompted for a security key, if I put in my private key ( ".pem" RSA key, which works fine to sign my binary image), the following error message comes up: "Error: Create Basic OTA Error:Wrong key file".

As a side question, what does the "ota.dat" do ? Does this file has to be "updated" with my new key ?

Thanks a lot !

Vincent V.