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Questions &/or issues related to products in the Audio category should be posted in this forum.

We have integrated the Wav trigger boards by Sparkfun into our prototype and everything works well.
After the above, we developed a custom Wav Trigger board using the same design provided by Sparkfun. We received our custom Wav Trigger boards a few days ago and of course, the onboard MCU is new and empty.

Now, coming to the issue: I tried flashing the firmware using the flasher tool and it doesn't seem to flash our custom boards. I believe this may be due to there being no bootloader present in the chips of our custom boards which is not the case with the Sparkfun boards when shipped.

Any insights and support would be appreciated.