usbser.dll can't work. IssueBulkTransfer function returns USB_DEVICE_NOT_RESPONDING_ERROR

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Hi
I am communicating with a USB modem device on WinCE 5.0 . I use
usbser.dll as its
driver. After the device gets enumerated, I am able to get the device,
configuration, interface
and endpoint info properly.
Later, when I call lpIssueBulkTransfer, I am getting 0x05
(USB_DEVICE_NOT_RESPONDING_ERROR)
as the error code from lpGetTransferStatus (I wait till the transfer
completes) each and every time.
Can someone tell what is the possible reason for getting that
error?
There cannot be any firmware error as the same device is working
absolutely
correctly when connected to a Win XP machine.

Thanks in advance.
.

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