PCROP Not disabled after RDP Regression, Option change not possible in RDP0

[aco990]

Hello everyone,

I'm experimenting PCROP activation on stm32h743 following this ST-tutorial: https://youtu.be/7Wr90XFA8_Q?si=tDpqUtMdin9Oyn-P

The activation works fine but i cannot disable PCROP using CubeProgrammer.
I did a RDP1 to RDP0 regression with DMWP1 checked but the PCROP is still active

After RDP regression i can se that the unprotected flash are is erase:

But not the protected one:

I can also not change the option bytes anymore, even RDP0 to RDP1 does not work

How can i recover from this situation ?

@Jocelyn RICARD, @Fred 

[aco990 · Accepted solution]

Hi @Jocelyn RICARD ,

now PCROP is removed and the device is working fine! :)
If you encounter the same problem a "bank mass erase with automatic protection-removal" as described in the reference manual could help you:

__HAL_FLASH_CLEAR_FLAG_BANK1(FLASH_FLAG_ALL_ERRORS_BANK1);
HAL_FLASH_OB_Unlock();

SET_BIT(FLASH->PRAR_PRG1, FLASH_PRAR_DMEP);
uint32_t temp = ~((0xFFF << 0) | (0xFFF << 16));
FLASH->PRAR_PRG1 &= temp;  // Clear bits 11:0 and 27:16
FLASH->PRAR_PRG1 |=  (2 << 0);
FLASH->WPSN_PRG1 = 0xFF;

HAL_FLASH_Unlock();
SET_BIT(FLASH->CR1, FLASH_CR_BER);
SET_BIT(FLASH->CR1, FLASH_CR_START);
while (READ_BIT(FLASH->SR1, FLASH_SR_QW) > 0) {} // Wait for erase completion

[Meenakshi]

Enable and Disable the SPRMOD check box 

ENABLE the SPRMOD: 

Step1: Connect the MCU via JTAG/SWD 

Step 2: Open the STM32CubeProgrammer or Download the STM32CubeProgram- Link: https://www.st.com/en/development-tools/stm32cubeprog.html 

Step 3: Open STM32CubeProgrammer and press the Connect button. 

Step 4: Go to Option bytes 

Step 5: Check the SPRMOD 

Step 6: Successfully Enable the flash protection 

Disable the SPRMOD: 

Step 1: MCU has RESET switch (SW 1). Press the Switch (Hardware Reset Switch) 

Step 2: Disconnect the ST_Link 

Step 3: Change the Mode to Under reset and Change the Reset mode to Hardware reset. 

Step 4: After Connect the MCU via ST_Link 

Step 5: Change the RDP from AA to BB 

Step 6: Click Apply 

Step 6: Change RDP to AA and Uncheck the SPRMOD 

Step 7: Click Apply 

Step 8: Finally Disconnect and Connect the MCU for checking process. 

[Michael3368]

I have the exact same issue with STM32H745 and STM32CubeProgrammer 2.17.0.

Did anyone figure out if PCROP can be changed (to disable the protection) using STM32CubeProgrammer, or is it necessary to do this with code as the accepted solution shows?