Make sure that you use crowbar cover more than the nail head prior to hammering it.
See stage 3, and be willing to tough it a little bit. First clean the roof and destroy any moss and lichen. Visit the mines: Mount Isa retains world's biggest effective mines. https://turnkeymodular.ca/an-more-than-view-of-rubber-epdm-and-epdm-flat-roofs/