[STM32H753ZIT6]: ERROR common_flash.c: Failed to unlock flash option!

[ND-creator]

• I made serious effort to avoid creating duplicate or nearly similar issue
• Programmer/board type: STLINK /V3
• Operating system an version: raspberry pi os version 12 Bookworm
• stlink tools version : v1.8.0-32-g32ce4bf-dirty
• stlink commandline tool name: st-flash --format binary write /home/pi/opt_h7.bin 0x5200201c
• Target chip: STM32H753ZIT6

Commandline output:
`sl->flash_type: 0x00000008
unlock - optkey_reg: 0x52002008
unlock - optkey2_reg: 0x52002108
unlock - optkey1: 0x08192A3B
unlock - optkey2: 0x4C5D6E7F
stlink_write_debug32: 0x08192a3b to 0x52002008
Error Checking the command execution status stored in the first byte of the response, cmd:WRITEDEBUGREG error rxbuf[0]:(0x19)
size: -1
stlink_write_debug32 result: -1
stlink_write_debug32: 0x4c5d6e7f to 0x52002008
Error Checking the command execution status stored in the first byte of the response, cmd:WRITEDEBUGREG error rxbuf[0]:(0x19)
size: -1
stlink_write_debug32 result2: -1
is locked ? 1
stlink_write_debug32: 0x08192a3b to 0x52002108
Error Checking the command execution status stored in the first byte of the response, cmd:WRITEDEBUGREG error rxbuf[0]:(0x19)
size: -1
stlink_write_debug32: 0x4c5d6e7f to 0x52002108
Error Checking the command execution status stored in the first byte of the response, cmd:WRITEDEBUGREG error rxbuf[0]:(0x19)

size: -1

2024-06-05T18:10:23 ERROR common_flash.c: Failed to unlock flash option!
2024-06-05T18:10:23 ERROR option_bytes.c: Flash option unlock failed!`

Expected/description:
I can flash my STM32H753 but not the option bytes.
The unlock of the flash works but not the unlock of the flash option.
I can read and write my STM32H753 using STM32CubeProgrammer.
In the function send_recv() from usb.c, I don't know what the error code 0x19 on rxbuf[0] is about, this code error is not handled by the source project.
I modified the source code to only add some printf() for debug purpose.
I also try with STLink V2 the unlock flash option still not work but error code not the same: 0x15 (STLINK_DEBUG_ERR_DP_FAULT) for the first key and 0x11 (STLINK_DEBUG_ERR_AP_FAULT) for the second key

[ND-creator]

I have found the solution: in the function unlock_flash_option() i do not use optkey2_reg by not writing to this register then the unlock flash option works.