<?xml version="1.0" encoding="utf-8"?>
<Parameters>
  <Parameter Name="ConsiderChamfer" Value="True" />
  <Parameter Name="ConsiderFillet" Value="True" />
  <Parameter Name="ConsiderHole" Value="True" />
</Parameters>

Dim XMLPath As String = "C:\XMLParameter.xml"
Dim XMLDoc As Xml.XmlDocument
Dim Parameter As Xml.XmlNode
Dim root As Xml.XmlNode = XMLDoc.DocumentElement
 
XMLDoc = New Xml.XmlDocument
XMLDoc.Load(XMLPath)
 
Parameter = root.SelectSingleNode("descendant::Name[Name='ConsiderFillet']")

Parameter.LastChild.InnerText="False"
XMLDoc.Save(XMLPath)