We just released a new feature that allows you to have firmware programmed onto your devices during the manufacturing process.
On the project page you'll now see a "Firmware" tab. On the lower left hand corner there is an option to upload your own firmware.
Once you upload your file you can select which reference designator you need the firmware to be added to. You can, of course, also delete the file if you need to provide an updated one. Once you place an order the firmware files will automatically be included with the rest of the details required for manufacturing. Typically the programming for high volume is done before assembly and for low volume after assembly. If you have any special instructions you can use the issues system to communicate with the factory or contact us directly.
If you try out this new feature let us know how it works for you!