Ошибаетесь... При Level 2 возможно чтение, запись и стирание только при Booting from Flash memory... да и то... Option Bytes - невозможно...
А вот Debug features, Boot from RAM or from System memory bootloader при Level 2 невозможны... как и Option Bytes... а это уже приговор...
Цитата:
Level 2: debug/chip read protection disabled
The read protection Level 2 is activated by writing 0xCC to the RDP option byte. When
the read protection Level 2 is set:
– All protections provided by Level 1 are active.
– Booting from RAM or system memory bootloader is no more allowed.
– JTAG, SWV (single-wire viewer), ETM, and boundary scan are disabled.
– User option bytes can no longer be changed.
– When booting from Flash memory, accesses (read, erase and program) to Flash
memory and backup SRAM from user code are allowed.
Memory read protection Level 2 is an irreversible operation. When Level 2 is activated,
the level of protection cannot be decreased to Level 0 or Level 1.
Note: The JTAG port is permanently disabled when Level 2 is active (acting as a JTAG fuse). As a
consequence, boundary scan cannot be performed. STMicroelectronics is not able to
perform analysis on defective parts on which the Level 2 protection has been set.
См. Table 17. Access versus read protection level...
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