Hi
Try the information about locked memory into the pdf attach.
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Example of topic about unprotection the flash memory to write.
"4.4.11 Temporary unprotection
Bits WyPx of FNVWPXRH/L-FNVWPIRH/L can be temporary unprotected by executing the
Set Protection operation and writing 1 into these bits.
Bit ACCP can be temporary unprotected by executing the Set Protection operation and
writing 1 into these bits, but only if these write instructions are executed from the Flash
Modules.
To restore the write and access protection bits it is necessary to reset the microcontroller or
to execute a Set Protection operation and write 0 into the desired bits.
It is not necessary to temporary unprotect an access protected Flash in order to update the
code: it is, in fact, sufficient to execute the updating instructions from another Flash bank.
In reality, when a temporary unprotection operation is executed, the corresponding volatile
register is written to 1, while the non-volatile registers bits previously written to 0 (for a
protection set operation), will continue to maintain the 0. For this reason, the User software
must be in charge to track the current protection status (for instance using a specific RAM
area), it is not possible to deduce it by reading the non-volatile register content (a temporary
unprotection cannot be detected)."
