Can a Raspberry Pi be used to flash firmware to a P1?

Just wondering if a rasberi PI can be used to flash firmware to a P1 through DFU?

Wouldn’t see why not

You’ll want to look at doing it manually first by using the dfu-util tool. See the firmware programming docs, specifically the “local DFU-UTIL” section.

Then you can automate this with the Particle firmware for the Pi.

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I’m fairly certain that you can you can install dfu-util through installing po-util on Raspberry Pi.

po-util is a utility I created mainly for facilitating building with the local toolchain, but it also helps to properly install various dependencies for local development, manage libraries, update devices, and more.