Connect your Arduino board or the MCU you want to use as a modchip, to your ISP programmer that you just created, following the schematics. I introduced this test because even if avrdude tells you ...
Wiring of VS1053 board (SPI connected in a standard way) to Wemos D1 Mini : VS1053_CS (D1 mini pin D8) (Arduino pin 15) VS1053_DCS (D1 mini pin D0) (Arduino pin 16 ...
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