Hi Enrico,
There is already RM rev.6 available, so I will use the updated revision.
Please see the bellow sections
• FTFC Functional mode of operation: Section 35.1 Chip-specific FTM information / 35.1.6 Flash memory modes
• How to write ERSAREQ bit: Section 35.1 Chip-specific FTM information / 35.1.7 Erase all contents of flash memory
• FOPT: Section 24.3.2 FOPT boot options.
• Access to FTFC resources when secured: Chapter 5 Security overview / Section 5.2.1 Flash memory security
Regards,
Daniel