Flashing dead ESCs

https://nathan.vertile.com/blog/2015/11/16/flashing-xrotor-20a-with-blheli-via-4w-if/#make-the-4-way-interface

https://media.discordapp.net/attachments/145568683136122880/401533449753853963/IMG_20180112_094324.jpg?width=961&height=609