This page points to the PDF files hosted at NXP site. It means the blog does not keep a copy of the PDF files.
The documents pointed here are for the latest BSP release. It means when the next GA release is out, the link will point to the future release document.
Currently, the latest BSP releases are:
- Linux: L4.9.88_2.0.0 GA
- Android: O8.0.0_1.0.0 GA
Another good central place to be up-to-date with i.MX software releases is i.MX Software and Development Tool.