Soft breaks

I replaced a master cylinder on a 1990 Toyota pickup 4wd std cap and now cannot seem to get all the air out of the front breaks. I benched bleed the master cylinder and can get one squirt of fluid and then nothing. I tried a master bleeder kit on the front break port of the master cylinder and i get the same thing. The master cylinder is a reconditioned, and i have tried two different cylinders. The master cylinder still has the original reservoir on it.

Bleed the farthest wheel from the master cylinder first or the right rear. Then the left rear, right front, and finally the left front. Don’t allow the bleed hose at anytime to be open to the atmosphere, always in brake fluid.

and the preson who is pumping the breaks is holding it on
the floor after pumping it