using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var fromTeltonikaConfigurator = true;

        var DS1990A                   = "01044823BAE83EBA";

​

        var bytes = Enumerable

            .Range(0, DS1990A.Length)

            .Where(x => x % 2 == 0)

            .Select(x => Convert.ToByte(DS1990A.Substring(x, 2), 16))

            .ToArray()

            .AsSpan();

        if (!fromTeltonikaConfigurator) {

            bytes.Reverse();

        }

        var rfidLowFreqBytes = bytes.Slice(1, 4);

        Console.WriteLine($"{BitConverter.ToInt32(rfidLowFreqBytes)}");

    }

}