Android Question if "M" = "M" but false, "µ".ToUpper => "M" <> "M" ?

sIRAblType = ... could get "M" or "µ" ... or others ...
Log("IRDA-Version JA - Typ:'" & sIRAblType & "' (1)")     ' shows 'M' or 'µ' (1)
sIRAblType = sIRAblType.Trim.ToUpperCase ' µ 0> M
Log("IRDA-Version JA - Typ:'" & sIRAblType & "' (2)")     ' shows 'M' !      (2)
Select sIRAblType
    Case "M", "µ"
         ... here I only see the original 'M' values
    Case Else
         ... here I see the original 'µ', but now 'M'
         Log("..." & sIRAblType & "' " & oIRDA.Text)  ' shows 'M' from µ records.  
End Select

if sIRAblType = "M" or sIRAblType="µ" then 
   ' shows TRUE when it was a M record, but 
else
   ' shows FALSE after <Trim.ToUpperCase> has changed 'µ' to 'M'
endif