Javascript hexadecimal to ASCII with latin extended symbols

I am getting a hexadecimal value of my string that looks like this:

String has letters with diacritics: č,š,ř, ...

Hexadecimal value of this string is:

0053007400720069006E006700200068006100730020006C0065007400740065007200730020007700690074006800200064006900610063007200690074006900630073003A0020010D002C00200161002C00200159002C0020002E002E002E

The problem is that when i try to convert this value back to ascii it poorly converts the č,š,ř,.. and returns symbol of little box with question mark in it instead of these symbols.

My code for converting hex to ascii:

function convertHexadecimal(hexx){

  let index = hexx.indexOf("~");
  let strInfo = hexx.substring(0, index+1);
  let strMessage = hexx.substring(index+1); 
  var hex  = strMessage.toString();
  var str = '';     
  for (var i = 0; i < hex.length; i += 2){     
      str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));     
  }
  console.log("Zpráva: " + str);
  var strFinal = strInfo + str;
  return strFinal; 
}

Can somebody help me with this?