I think you just need to keep winding the focusser knob, you are way past focus in the first picture but you can see the image get smaller as you approach focus. The last image looks like you may be there or thereabouts, I think the colored diffraction patterns are caused by the camera optics.
The images in the question show a progression from severely out of focus (large disc with shadow of secondary mirror) to nearly in focus (six-way diffraction pattern). There are a few things you can try:
- In daylight, make sure that the the secondary mirror support vanes are parallel to the optical tube axis. This may reduce the diffraction artifacts.
- The light from a very bright source will show weaknesses in all but the finest optical systems. Use a neutral-density "moon" filter to reduce the overall brightness.
- Point sources make it easier to find the point of best focus. Focus on a nearby star faintly visible to the naked eye, then aim the telescope at the planet and wait for steady air.