Method for STM32L4R9ZIJ6 change boot mode?

[YYu.2]

I have one STM32L4R9ZIJ6, and I loaded BootLoader on 0x08000000 and BLE Sensor bin on 0x8005000. However, when the board doesn't seems boot into the program. Red LED flashing when plugged USB power. Using Flash Loader, it ask for verify boot mode configuration. What should I do to make it work? Thanks for any kind of help.