Industrial revolution in the Middle Ages

The old friends woke up. One was on the way from Wangdu to the wild border, and the other was robbed in a mine cave. They somehow crossed into the middle ages. The church's ideological control, backward technology and the plague that could erupt at any time. How can they break out in such a place when they are not alone? Of course, with the power of technology, magic? Witchcraft? Knight? There are paper tigers in front of the cannon!