The computer cable is not connected properly.

B, use the data cable sent by this machine.

Solution: Turn off the computer or try to connect the computer when it is turned on; Try to connect a mobile phone or other electronic products with memory to the computer. If it is a computer-driven problem, it will not be recognized. Or try to connect to another computer.

Some data cables are broken and cannot be identified, so they can only be recharged. In this case, we can try to connect these commonly used data lines because the data line interface we are equipped with is common with mobile phones, MP4, MP3 and other digital products. If not, we can try to find out if there is a data cable interface in the store selling digital products near you, just like the one with a recording pen.

If nothing else works, the USB interface of the recorder is broken. It needs to be sent back to the manufacturer for repair.