1. Gudie guide, DAC driver download,firmware download link for BTA30 Pro

Quick start guide：

https://drive.google.com/file/d/1WyvqyUDY0IwVQoU6gxatEEi2qaq3_ta3/view?usp=sharing

USB DAC：

https://forum.fiio.com/note/showNoteContent.do?id=202105191527366657910&tid=17

Firmware download:

https://forum.fiio.com/note/showNoteContent.do?id=202111261622435733011&tid=124

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