Yes you should be able to do it just find the version your looking for. Delete the current version on your box. Now install the version you like. I don't think it's like iOS where it won't let you downgrade. Just an option
You need to flash the box with the version you want. Don't think wooshbuild page has a link for the older version though. You don't delete but simply flash over what's already there.
Make sure you have a backup of your line before starting.
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