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Connect it to a PC with USB cable, choice “Mass Storage”
handsets will automatic turn off.
• Step 3 Open Device Manager
• Step 4 Double Click the Unknown USB Device
• Step 5 Click the
Reinstall Driver button
C2500
55
Type
A
Type B
USB Cable
USB port (Type A) on PC
USB port (Type B)
on the player
USB Config :
COM Port
Mass Storage
OK Back
Unknown USB device