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erase is not working in my board

Ilyes Ouled Omar

Hello everyone,
I'm developing a code in STM32F407VG. this code will erase the flash memory in a first step, and for a further work will upload a code into this memory.
this are my code for erasing the flash memory.
Please, give me where am I wrong.
(I should work directly with registers)

//unlocking the flash memory
if((FLASH->CR & 0x80000000) != 0x0)
        {
                FLASH->KEYR = 0x45670123;
                FLASH->KEYR = 0xCDEF89AB;
        }
//clear the flags
FLASH->SR |= (0x80 | 0x40 | 0x20 | 0x2);
// erase all pages
FLASH->CR |= 0x4 | 0x8000;
FLASH->CR |= 0x10000;
    /* Disable the MER Bit */
FLASH->CR &= ~(0x4 | 0x8000);

// writing

//locking flash
FLASH_CR |= 0x80000000;

Thank you.
Best regards.

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