so, it is more convenient to download through OTA than manual, the latter is inconvenient because you have to open the site first, go to the post, then you have to find your terminal (in my case Mi 8), download downloads (which takes a nice time for download, sometimes it is too slow!), this is why it is better to update via OTA, because so you only do 3 clicks (update> search> download), instead manual many steps (open the site> open the post> search the correct file for your terminal> click on the file> and finally download)