https://www.x-cart.com/blog/x-cart-4-7-7-released.html
Quote:
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We’ve updated the Mailchimp integration to API 3.0, and starting from v4.7.7 X‑Cart comes with the updated API out of the box. Besides, we’ve released Mailchimp update packs for X‑Cart v4.5.5-4.7.6.
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You can download the reBOOT files
here and can do a search for "Adv_Mailchimp_Subscription" to find the relevant new Smarty code.