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            <h1>HEX file checksum online calculator</h1>
            <i>Firmware for microcontrollers are often stored in <a href="https://en.wikipedia.org/wiki/Intel_HEX">Intel HEX files</a>.
            For testing and debugging sometimes it is necessary to change some values directly in the HEX file.
            The Intel HEX file format is easy to read and to modify except the checksum.</i>

            <h2>Analyse HEX f