Maybe in newer firmware, they've dropped cron? I don't think that Duokan would remove cron (and certainly not Librerator), though I'm not 100% sure of that. But there wouldn't be a reason to do so.
As it doesn't really depend on the exact time when it should run and probably it's okay to do it roughly every 5 Minutes, I think you can just put it in a "while sleep 300; do <updatecommand>; done" loop.
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