How to program the Option Bytes on a G0?

[JKaz.1]

I'm trying to program the option bytes on an STM32G0B1 but it keeps timing out at the end of the program sequence and never actually succeeds, no matter how many times I try.

I enable the Flash peripheral

I (successfully) unlock the flash

I (successfully) unlock the option bytes

I program the option bytes

... and it times out 10 times

then it calls OB_Launch and hard faults.

.. what am I missing? This was easy on the H7...

{	
	__HAL_RCC_FLASH_CLK_ENABLE();
 
	FLASH_OBProgramInitTypeDef flashDef;
	memset(&flashDef, 0, sizeof(FLASH_OBProgramInitTypeDef));	
	HAL_FLASHEx_OBGetConfig(&flashDef);
	
	if ((flashDef.USERConfig & OB_BOR_ENABLE) == 0)
	{
		for (int i = 0; i < 10; i++)
		{
			if (HAL_FLASH_Unlock() == HAL_OK)
				break;
		}		
		
		for (int i = 0; i < 10; i++)
		{
			if (HAL_FLASH_OB_Unlock() == HAL_OK)
				break;
		}	
	
		memset(&flashDef, 0, sizeof(FLASH_OBProgramInitTypeDef));
		flashDef.OptionType = OPTIONBYTE_USER;
		flashDef.USERType = OB_USER_BOR_EN;
		flashDef.USERConfig = OB_BOR_ENABLE;
	
		for (int i = 0; i < 10; i++)
		{
			if (HAL_FLASHEx_OBProgram(&flashDef) == HAL_OK)
				break;
		}
		
		HAL_FLASH_OB_Launch();
	
		for (int i = 0; i < 10; i++)
		{
			if (HAL_FLASH_OB_Lock() == HAL_OK)
				break;
		}
	
		for (int i = 0; i < 10; i++)
		{
			if (HAL_FLASH_Lock() == HAL_OK)
				break;
		}
	}
}

[Pavel A.]

Same thing as here?

[JKaz.1]

Yup, looks like it. I didn't find that post while searching the forums to see if anyone had similar difficulties... Kinda surprised this doesn't have an answer yet...