In 2029, John sends Kyle Reese to year 1984, where he finds a Sarah Connor who’s being trained by Model 101 since she was 9 years old. Here the defeat T-1000 (again). Sarah has created a time-travel machine, which requires no inorganic fibers to work. They travel to 2017 (year Skynet went public -now called Genisys in ‘17).
They find John Connor, whose being shot by Model 101. John Connor is now a cyborg sent by T-5000 (physical embodiment of Skynet). Model 101 & John Connor fight inside the time machine, which explodes (due to inorganic particles) killing John, and throwing Model 101 in Poly, upgrading him.
They go to Kyle Reese’s house (currently 10 years old) to tell create a memory that such things happened this year. A post-credit scene shows a Skynet CPU still intact.
T-3000 (John Connor)