How to upload firmware to your teensy based module?
Please ensure if the module is powered on when connected to the computer via a USB cable only.
If it turns on, please update the firmware using a USB connection only.
Only if it is not turned on connect it to the power of your Eurorack case during the update.
Under no circumstances should electricity be supplied from two sources!
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Download Teensy loader app from here.
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Connect the module to your computer via a USB cable (see note above)
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Load the HEX file (you can drag and drop the HEX file to the app window)
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Press the button on the back of the module