Hi,

From my side, I don't erase all the blocks. I'm only erasing the needed ones. I mean my application is currently less than 16Kb so I'm only erasing the 2 first blocks to save time.
Of course this is only the case for design purpose.

As I've not industrialized projects with this chip yet, I've not used the security bits.
I could simply see that sometimes, the security bit 3 is automatically set whereas I've haven't set it !

Regards
Stephane