Replaced all4 brakes and rear caliper can't bleed left rear and right front 2010

replaced the master cylinder still can't bleed.very frustrated

If you bled and primed the master cylinder and it is pumping fluid. I would go to the next component in line, most likely the ABS module, and verify that fluid is getting to module. Then at outlet ports on module crack the lines and verify fluid coming out of module. Since your original problem was with left front and right rear calipers not bleeding, then most likely problem is in one of those areas since most cars of that era have the master cylinder plumbed so that one chamber is cross connected to one front and one rear caliper so that if line blows out on one you still have one front and one rear brake.