Its probably too weak to hatch. They say after day 24, thier chances and strength diminish rapidly.
If you're not breeding for vigor... just have a backyard flock, I would open it.
Start very gently chipping away the shell.. it will bleed a bit. This is fine. You can stop if you want and let the veins dry. slowly peel away the membrane and let the chick out but stop when you get to the bottom (top) of the egg.
when you get to the bottom of the egg(where the chicky bottom is) , there will be veins connected to the navel (umbilical cord like) take off the shell, but leave the membrane. Place it back in the bator on a wet (with warm water) paper towel and let it finish drying out/absorbing any yolk.
You can cut these veins with tiny scissors but do NOT pull at them.. you will damage the navel.
It will probably be weak for a couple days.
Crank the humidity back down in the bator and let the temp stay around 95 for a day...
Don't put it in the brooder with the others til its walking.
Good Luck!!