C # - Communicating with WinUSB device with LIBUSB

I am trying to communicate with a Nokia Lumia (RM-917) phone, over USB, using LIBUSING and C #. LIBUSB can see device information (pid, vid, etc.). However, I am unable to successfully write ANY endpoint, even sending the exact command as a means of restoring Windows devices.

According to WinUSB, the recording endpoint is EP07, however, this endpoint is simply disabled. I've tried all the other endpoints and they all fail.

`
public void initDevice()
{


    if(this.lumiaDevice == null)
    {
        throw new Exception("LumiaPhoneManager does not have a selected device");
    }

    UsbDeviceFinder MyUsbFinder = new UsbDeviceFinder(0x0421, 0x0661);
    MyUsbDevice = UsbDevice.OpenUsbDevice(MyUsbFinder);


    IUsbDevice wholeUsbDevice = MyUsbDevice as IUsbDevice;
    if (!ReferenceEquals(wholeUsbDevice, null))
    {
        // This is a "whole" USB device. Before it can be used, 
        // the desired configuration and interface must be selected.

        // Select config #1
        wholeUsbDevice.SetConfiguration(1);

        // Claim interface #0.
        wholeUsbDevice.ClaimInterface(1);
    }

    if (this.writer == null)
    {
        writer = MyUsbDevice.OpenEndpointWriter(WriteEndpointID.Ep07);
    }



}


    public void readPCode()

{
    currentID++;
    var _x = new jsonPkt();
    ErrorCode ec = ErrorCode.None;
    int bytesWritten;
    _x.id = this.currentID + 1;
    _x.method = "ReadProductCode";

    string value = @"{""jsonrpc"":""<JSONRPC>"",""id"":<ID>,""method"":""<METHOD>"",""params"":null}";
    value = value.Replace("<JSONRPC>", "2.0");
    value = value.Replace("<ID>", currentID.ToString());
    value = value.Replace("<METHOD>", _x.method.ToString());


ec = writer.Write(Encoding.Default.GetBytes(value), 8000, out bytesWritten);
    currentID++;

    if (ec != ErrorCode.None) throw new Exception(UsbDevice.LastErrorString);

    byte[] readBuffer = new byte[1024];
    while (ec == ErrorCode.None)
    {
        int bytesRead;

        // If the device hasn't sent data in the last 100 milliseconds,
        // a timeout error (ec = IoTimedOut) will occur. 
        ec = reader.Read(readBuffer, 100, out bytesRead);

     //   if (bytesRead == 0) throw new Exception("No more bytes!");

        // Write that output to the console.
        this.rtb.Text += Encoding.Default.GetString(readBuffer, 0, bytesRead).ToString() + "\n";

    }
}