Unprotecting STM32WB50 flash seems to have bricked the MCU

[RLoco.1]

I protected the flash from code running on the MCU using HAL, but while trying to unprotect it using STM32CubeProgrammer the board could not be unprotected ("Expected value for Option Byte "RDP": 0xAA, found: 0xBB") and became unresponsive.

After this, I can not even connect to the board anymore. I believe this is the second time this happens, the first time I thought it was a hardware problem, but this time luckily I was using verbose level 3 and got a log, that is attached.

I have tried to power down the board completely, and also to connect using a JLink programmer, but it did not work.

Surprisingly, I had no problems with a STM32WB55 MCU.

Does anyone know anything about this problem?

[AOliv.1]

Hi,

I got a STM32F750VBT no one write work, read at 0x08000000 return 0, and Option bytes (Error: Option Byte Programming failed) no one option write work, maybe a damaged chip? The protection is disabled. but dont write.

Using ST-Link V2, work at a Bluephill, but not on stm32H750. someone can help?