The Flsun QQ-S Pro is one of the stark examples of the 3D printing community's strengths. This is because the large delta 3D printer comes with strong hardware, but firmware that does not meet the minimum requirements. Only a firmware from GitHub eliminates almost all problems of the QQ-S Pro in one fell swoop.
https://www.notebookcheck.net/Flsun-QQ-s-Pro-3D-printer-in-review-Hardware-top-firmware-flop.610100.0.html