按照标准方法连接，但是连接后显示连接失败，求助，急！
具体情况如下：
Connecting ...
- Connecting via USB to J-Link device 0
- J-Link firmware: V1.20 (J-Link ARM V8 compiled Dec 1 2009 11:42:48)
- JTAG speed: 5 kHz (Fixed)
- Initializing CPU core (Init sequence) ...
- Initialized successfully
- JTAG speed: 8000 kHz (Auto)
- J-Link found 1 JTAG device. Core ID: 0x0032409D (ARM9)
- Reading CFI info ...
- Could not find CFI compliant flash device
- Detecting flash memory ...
- ERROR: Could not find any flash devices
- ERROR: Failed to connect
