Help: Bootloader Flash Error

[meplus]

SFRC922D.png (38.44 KiB) Viewed 2496 times

I'm stuck at 49/100 while refreshing the bootloader. What could be the issue, and what should I do? My motherboard model is SFRC922D, and the main control chip is STM32F105 RBT6.

STM32F105.jpg (96.96 KiB) Viewed 2496 times