In article ,
says...

Im trying to help my best friend fix stuff around her house. Video games are
what her 'man' around here is good at so she calls her bestie lol. First is
this porch, idky theres a gap but its causing everything to be bowed. I just
need to move it down to even it off but the nails are too deep set. Need to
save the wood to reuse it but it wasnt weather treated so its falling apart.
Whats a trick to get these nails out without damaging the wood? I dont have a
drill, only a mini hammer and mini crowbar.. Ok guys ty for any help.
https://www.homeownershub.com/img/av

Saw the nails between the boards and drive them out from the bottom.