Chamber Child.

Beat the Fire temple, but do not enter the blue warp that appear when you defeat Volvagia.Use the Ocarina Items glitch( www.hyrulianguardian.blogspot.com for more info) to warp to the Temple of Time or save and reset, then warp there.Travel back in time.Warp to Death Mountain Crater as a child.Use the CC trick to get past the boulders blocking the entrance to the Fire Temple.Go to the room where you meet Darunia as an adult(the one before the boss room). Use a roll attack jump(roll just before Link jumps off the edge) to get onto the pillar in the middle of the room.Head to to edge closest to the Boss door, face away from it and stand right on the edge. Take out a bomb, drop it, then walk off the edge so that Link grabs onto it.Immediately climb back up.The bomb should blow up just as Link gets back on the platform and the explosion will cause him to do a larger than normal jump off the platform onto the Boss door platform.Enter the Boss room and go into the blue warp.Child Link will be taken to the Chamber of Sages.