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Domy_ST
Associate III
May 4, 2026
Solved

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

  • May 4, 2026
  • 2 replies
  • 131 views

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.

Best answer by mƎALLEm

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.

2 replies

mƎALLEm
mƎALLEmAnswer
Technical Moderator
May 4, 2026

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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    D
    Domy_STAuthor
    Associate III
    May 5, 2026

    hello @mƎALLEm,

    Thanks! Actually, that's not possible. A solution in my case could be to use the PCROP Protection option only for sector 0 of the FLASH.

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