jeyreem on "Exclude ID next_post / prev_post"

Hi everyone,

I've a little problem and i really need you. I dev a website, and i want to exclude an ID (only use for the home) in next_post/prev_post, i search on the web and i've found:
<?php previous_post_link('« %link', '%title', FALSE, 'IDofCat'); ?>
But that's don't work in my case, i make a cat only for this post but still doesn't work. And i prefer to exclude it only with ID of post if it's possible. I need you guys ! My code here:

<?php while (have_posts()) : the_post(); ?>
<div class="container" id="singlePort">  

    <div class="row content">
        <div class="col-md-1 col-sm-1"></div>
        <div class="col-md-10 col-sm-10">
            <div class="illuPort alignleft">
                <img src="<?php the_field('illustration'); ?>" alt="<?php the_field('txt_alt'); ?>" class="img-responsive illustration" />
            </div>
            <div class="contentSinglePort">
                <p class="topSinglePort"><span id="sector"><i class="fa fa-dot-circle-o"></i> <?php the_field('secteur'); ?></span><br/><a style="color: #4885d9;" href="<?php the_field('link_site'); ?>" TARGET='_blank'><i class="fa fa-link"></i> <?php the_field('link_site'); ?></a><p>
                <?php the_content(); ?>

            </div>
        </div>
    </div><!--/.row-->
    <div class="row">
        <p id="navigation">
            <span id="previous"><?php previous_post('<i class="fa fa-angle-left fa-2x"></i> %', 'Projet précédent : ', 'yes', FALSE, '26'); ?></span>
            <br class="hidden-lg hidden-md hidden-sm"/>
            <span id="next"><?php next_post('<i class="fa fa-angle-right fa-2x"></i>%', 'Projet suivant : ', 'yes', FALSE, '26'); ?></span>
        </p>
    </div>
    <?php endwhile; // end of the loop. ?>

PS: it's a custom post type so i don't know if you really care about that.

Best regards, have a nice day,
Jeyreem