> For the complete documentation index, see [llms.txt](https://docs.influxtechnology.com/support_guides/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.influxtechnology.com/support_guides/rexgen-open-api-application/device-library/rgusbdrv.dll/getfirmwareversion.md).

# GetFirmwareVersion()

#### C\#

```csharp
[DllImport("RGUSBdrv.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern byte GetFirmwareVersion(out ushort MajorVersion, out byte 
MinVersion, out byte BranchVersion, out byte FwType);

```

#### Returns:

out ushort MajorVersion, out byte MinVersion, out byte BranchVersion, out byte FwType

#### C# Example:

```csharp
public static string GetFirmware()
{
 string[] FirmwareReleaseType = new string[4] { "", "A", "B", "RC" };
 byte MinVersion, Res, BranchVersion, fwType;
 ushort MajorVersion;
 Res = GetFirmwareVersion(out MajorVersion, out MinVersion, out BranchVersion, out fwType);
 return $"{MajorVersion}.{MinVersion}.{BranchVersion} {FirmwareReleaseType[fwType]}";
}
private void btnGetFirmware_Click(object sender, EventArgs e)
{
  if (USBDllComm.Connected)
  lblGetFirmware.Text = GetFirmware();
}
```


---

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