static extern UInt32 CM_Reenumerate_DevNode_Ex(UInt32 dnDevInst, UInt32 ulFlags, IntPtr hMachine);

Declare Function CM_Reenumerate_DevNode_Ex Lib "setupapi.dll" (dnDevInst As UInt32, ulFlags As UInt32, hMachine As IntPtr) As UInt32

     if(CM_Reenumerate_DevNode_Ex(devRoot, 0, IntPtr.Zero) != CR_SUCCESS) return false;