Im really not sure of your actions and methods you performed but also dont have time to teach who doesnt have some basics.
If its “Locked” as you say…how and were or doing what you also didnt mentioned or care for (we are fortune tellers and we guess it all), an SPI programmer can be used or you can try the methods in the following threads:
[Guide] Unlock Intel Flash Descriptor Read/Write Access Permissions for SPI Servicing - Special Topics / Intel Management Engine - Win-Raid Forum (level1techs.com)