How to make oxygen on Mars and make it livable?

After careful search and research, I think there are several ways to do it.

1. Water ice is heated by solar energy, and oxygen and hydrogen can be produced by electrolysis of water. But there is a little ice at the poles of Mars, which can't decompose much oxygen. I'm afraid it's not even 1% of the atmosphere, and it will be oxidized with other minerals soon. Without enough water, people don't even want to immigrate to Mars.

2. The most ideal way is to use plants to convert carbon dioxide and produce oxygen. 95% of the Martian atmosphere is carbon dioxide, which is converted into oxygen by plants. Isn't it more stable and reliable in the long run and more widely used? For a long time, plants changed the atmosphere of Mars. Plants can fix water and soil, plants can eat, plants can form an ecosystem and form an ecological chain of living things. But it is very troublesome to provide suitable soil, temperature, light, moisture and so on first. Martian soil is very dry and contains toxins. Mars has already lost its magnetic field, the air is thin and the radiation is quite strong, which is not conducive to the survival of plants. At first, I'm afraid it can only be used in a small area of the living base.

3. Use Martian soil to make oxygen. According to the research of some scientists, Martian soil can produce oxygen through some special chemical reactions and special enzymes.

4. Use bacteria to make oxygen. Some time ago, Dutch scientists discovered a magical bacterium that can decompose nitrogen oxides into oxygen and survive in an oxygen-free environment.

Firstly, the carbon dioxide in the atmosphere of Mars is absorbed by machines, and then it is converted into oxygen by electrolysis. Or by reacting carbon dioxide with sodium oxide, oxygen can also be produced, but it is not as convenient as the first method, and it is difficult to find sodium oxide on Mars.

However, the premise of transforming Mars into a livable planet is to make the core of Mars rotate and restore the magnetic field. Otherwise, without a magnetic field to protect Mars, the atmosphere will be blown away by the solar wind, and a large number of high-energy particles will radiate to the surface of Mars, and plants will not survive. Even if you immigrate to Mars, you will only live in a small and closed living area forever.