Escpos commands: feed paper in reverse direction with printer SUNMI V2S PLUS

Question

I have two machines: 1- SUNMI V2S ,2-SUNMI V2S PLUS. And i use escpos command 'ESC K d' in printer sunmi v2s to make paper feed in reverse direction so make paper return back for adjusting,and in SUNMI V2S PLUS it doesn't work even with same commands, and it print directly string like 'Kd'.

Dim REVERSEFEEDPAPER As String=Chr(27) & Chr(75)& Chr(100)
Printer1.WriteString(Printer1.REVERSEFEEDPAPER)

Public Sub WriteString(data As String)
'   WriteString2(data, "IBM437")
    WriteString2(data, "UTF8")
End Sub

' Send the string to the printer in the specified encoding
' You also need to set the printer to a  matching encoding using the CodePage property
' Beware of using WriteString2 with Chr() to send numeric values as they may be affected by codepage substitutions
' Most character level operations are pre-defined as UPPERCASE string variables for easy concatenatipon with other string data
Public Sub WriteString2(data As String, encoding As String)
    Try
        If Connected Then
            Astream.Write(data.GetBytes(encoding))
'           Astream.Write(data.GetBytes("UTF8"))
        End If
    Catch
        Log("Printer error : " & LastException.Message)
        AStream_Error
    End Try
End Sub

Can anyone help me? Thanks in advance and Best Regards

Azzurra