New PCB blink pattern, cyan blink to single yellow blink (repeats forever)

Hardware
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I just got a batch of new PCB’s from our supplier. The first two checked out fine, but the third I’m testing shows a LED blink pattern that I’ve never seen before: https://www.youtube.com/watch?v=fZGzktXHoL8 At the end I’m holding a piece of paper over the LED to better see the color.

I’m flashing it using CLI Version 1.31.0 on OSX. I use a standard setup script that feeds it wifi credentials and firmware. After getting credentials, the board tries to go online, but instead of going online it does a single yellow blink and then goes back to try finding a connection. Since the board never goes online, I cannot claim it. The board updates fine, it flashes fine but it just won’t go online.

The board runs through the “particle doctor” without any errors. I have not tried replacing the keys since CLI shows me a warning against replacing keys on a device that have never been claimed.

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I’d reset the keys. Since you have not claimed the device yet it’s safe to do it. That’s the most common reason for a pattern like that. A DNS problem could also cause that, but since the other boards worked keys are more likely.

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Thanks! Resetting the keys worked. I guess the text displayed in CLI Doctor is outdated? Or is it valid in any other case?

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That message is sort of correct. It was really the particle keys server part that needed to be done, and that’s always safe to use. The particle keys doctor DEVICE_ID step is the dangerous one if you do it to a device claimed to another account. But it is fine for a device claimed to your account, and doesn’t really do anything for a never-before-claimed device, so it was OK in your case.

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