Made this, hope it's of use, had fun making it but it's a lot of work and for some reason some of my text is screwed up. Oh well, enjoy, hope it helps people understand how to do it!
I liked mega's video guide, thorough and explained everything.
but this is nice, something shorter for when I need to remind myself how to flash autoboot.
note: what helped me get within the 8 second window for moving the SD card was holding both slots in 1 hand, press A then you easy access to both slots and make the move.
(kind of like how you hold your wire and solder to tin the wire)