I believe the OP confuses the subtle differences in eBike companies today. So many of the small companies are just importers and shippers. They receive eBikes in boxes and ship eBikes in boxes. That's it. All the technical work, including engineering, is done in China. Nothing is engineered here except for the colors and stickers put on the eBikes. Now remember, this is just my experience and by no way would I know how every company works. But taking my experience from early Sondors. There the technical assistance was referred to a Facebook owner's group and technical repairs were done by a guy in his apartment who received parts from Sondors.