How to get a particle electron public keys?

Firmware
1

Hey,

Does anyone know how can I get the public keys for particle electron?
I know it’s a file that I need to generate (device.der), but I followed this article :

but I don’t know why it didn’t work. If someone knows and can help me please don’t hesitate to write me.

2

Electron
Electron916×289 8.69 KB

I get this , how am supposed to get the file ?

3

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