tiny6410开发板，dnw不能备份，已安装usb下载驱动，并用SD-Flasher.exe成功写入BIOS，用SD启动LED1正常闪烁，启动DNW显示usb:ok。
选Status输出如下：
===== USB DEVICE STATUS =====
USB_CONFIGURATION_DESCRIPTOR
bLength = 0x9, decimal 9
bDescriptorType = 0x2 ( USB_CONFIGURATION_DESCRIPTOR_TYPE )
wTotalLength = 0x20, decimal 32
bNumInterfaces = 0x1, decimal 1
bConfigurationValue = 0x1, decimal 1
iConfiguration = 0x0, decimal 0
bmAttributes = 0xc0 ( ??? UNKNOWN!! )
MaxPower = 0x19, decimal 25
-----------------------------
USB_INTERFACE_DESCRIPTOR #0
bLength = 0x9
bDescriptorType = 0x4 ( USB_INTERFACE_DESCRIPTOR_TYPE )
bInterfaceNumber = 0x0
bAlternateSetting = 0x0
bNumEndpoints = 0x2
bInterfaceClass = 0xff
bInterfaceSubClass = 0x0
bInterfaceProtocol = 0x0
bInterface = 0x0
-----------------------------
USB_ENDPOINT_DESCRIPTOR for Pipe00
bLength = 0x7
bDescriptorType = 0x5 ( USB_ENDPOINT_DESCRIPTOR_TYPE )
bEndpointAddress= 0x81 ( INPUT )
bmAttributes= 0x2 ( USB_ENDPOINT_TYPE_BULK )
wMaxPacketSize= 0x200, decimal 512
bInterval = 0x0, decimal 0
-----------------------------
USB_ENDPOINT_DESCRIPTOR for Pipe01
bLength = 0x7
bDescriptorType = 0x5 ( USB_ENDPOINT_DESCRIPTOR_TYPE )
bEndpointAddress= 0x2 ( OUTPUT )
bmAttributes= 0x2 ( USB_ENDPOINT_TYPE_BULK )
wMaxPacketSize= 0x200, decimal 512
bInterval = 0x0, decimal 0
-----------------------------
但backup NandFlsah出错。
显示
=============== USB Backup Start ==============
Error: can't receive data from the USBD, for mtd info
=============== USB Backup Failed err:284 ============
请教，该怎么做才能正常备份。
