Complete Custom Firmware without Particle Components

Hey there.
I am currently developing some IOT Devices based on STM32 controllers.
The Photon board would fit my Hardware Specific needs perfectly fine. But i don’t want to use the photon specific firmware rather develop my own firmware. So the question is: Can i completely reprogram the controller with my own firmware or is the chip read/write protected?

Thanks in advance.
Rob

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It’s all open source, have at it :wink:
What’s wrong with the existing Particle stack though?

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