Aio board simplertk2b solder?

i ordered my simplertk withou headers , ? i have is do i need to solder every pin or only the ones marked with identifiers on the simplertk board

just get some standard 2.54mm headers put them on your AIO board and then solder the F9P
theoretically you don’t need to solder every pin, but it’s a good soldering practice (and looks nicer that way)

You’ll likely need a few more headers for cytron, teensy, please check out the wiki with links: