Managed to fix this Lumia 800. Well it turns on lol (it didnt before).
I can connect to this, but all it says is Nokia Dload, which according to some sites means I need a bootloader.
Because the logic board / motherboard I've got is unlocked, it needs a bootloader to load the bloody thing, or to see anything on the screen lol.
The seller didnt mention this on the site
There's a lot of fixes / ways to do it on different sites. But does anyone know an easier way??
I think you can do it, with an ATF flasher or something.