Press and hold the power/volume knob 10 second to reset. IBasso is a registered trademark of Shenzhen Albasso Technology Co., Ltd., a domestic portable audio equipment manufacturer. Albaso Technology's main products cover headphones, power amplifiers and portable high-definition lossless music (Hifi) players, and its DX80 and DX 100 have won unanimous praise from the industry. Dx300 belongs to iBasso, and can be reset by pressing the power/volume knob 10 second.