Need to Program STM8L151C6 using USART bootloader application. Configured ROP OFF & BL OPT BYTES to 55 AA using STVP. But BL not working. Pls Help in this.

[SKARU.51]

Boot Loader Option Bytes Settings

Option byte 0: AA

Option byte 1: 00

Option byte 2: 00

Option byte 3: 00

Option byte 4: 00

Option byte 5: 55

Option byte 6: AA

Memory checksum: 0x1A9