how to change from RDP level = 1 to RDP level = 0 without erase flash device stm32h7

Domy_ST · ‎2026-05-04

hello ST Community,

Is it possible to change the RDP "Read Out Protection" level from level 1 to level 0 without erasing the flash data?

I've currently been able to change the level from RDP level 1 to level 0 for Nucleo-H755ZI-Q, but changing the level causes a mass erase of the flash drive. Is it possible to avoid this? If so, is there a code example?

Thanks for your support.

mƎALLEm · ‎2026-05-04

Hello,

Definitely not possible. It's a protection to prevent reading the flash content after protecting it. Otherwise, it doesn't make sense to make the content readable after regression.

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