Change swiper autoplay transition speed

[dani]

Hi,

I'm trying to send a new speed variable to the carousel swiper function. The JS is

var w = jQuery(a).find(".swiper-container"),
                           m = new Swiper(w[0], {
                               speed: 350,
                               effect: "slide",
                               spaceBetween: v,

And I'm adding this in an HTML block on the page

<script>
jQuery( document ).ready( function() {

   const imageCarousel = jQuery ( '.swiper-container' ),
      swiperInstance = imageCarousel.data( 'm' );

   swiperInstance.params.speed = '1000';

   swiperInstance.update();
}); 
</script>

Error in the console is:

(index):1352 Uncaught TypeError: Cannot read property 'params' of undefined
    at c.Channel.<anonymous> ((index):1352)
    at p (backbone.min.js?ver=1.4.0:2)
    at f (backbone.min.js?ver=1.4.0:2)
    at c (backbone.min.js?ver=1.4.0:2)
    at c.Channel.n.trigger (backbone.min.js?ver=1.4.0:2)
    at frontend.app.min.js?ver=3.8.5:1

Anyone know how to set a new speed via a script?

Thanks!

[dani]

This post is deleted!