Yup… The core will need to be in breathing cyan for claim to happen.
Rapidly flashing red and yellow means that the keys are bad. You can place the core in DFU-mode and use spark keys doctor to fix that.
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Holy shit, you are awesome! Thanks for bearing with me here 
Cheers kenneth!
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Thank you for the post, I had the same problem and it was driving me crazy. Tried just about everything …