It's only been half an hour since your first post!
Remember that this is an international forum - not everyone is even awake at this time of day.
Also, it's a community forum - most participants are not ST employees.
If you want direct support from ST, see: https://www.st.com/content/st_com/en/support/support-home.html
If you're not getting answers to your question, the first thing is to check whether your question is clear and complete enough for people to understand & reply - see:
How to write your question to maximize your chances to find a solution
Did you look at the examples on the X-NUCLEO-GFX01M2 Product Page:
https://www.st.com/en/evaluation-tools/x-nucleo-gfx01m2.html#tools-software
PS:
The SPI NOR Flash on the X-NUCLEO-GFX01M2 is documented in the User Guide - starting on page 11:
See also the schematics:
https://www.st.com/en/evaluation-tools/x-nucleo-gfx01m2.html#cad-resources
From there, you can find details of the memory chip:
