I wanted to play with ReadProtection(RDP) so I wrote 0x0000 to 0x1FFFC000 and expected that it will switch to level 1 but I can not do anything with my Nucleo64-F446RE. My question is how can I switch it back to level 0 and continue working with my board?

[OKuro.1 · Accepted solution]

I have found the solution. In the Stm32CubeProgramming there is ability to work with OB separately so using it I switched it back to level 0.