404. That’s an error.
The requested URL /lib/exe/detail.php?id=bootloader%3Astm32-hid-bootloader&media=assets:stm32_hid_bl_01.png was not found on this server. That’s all we know.
/lib/exe/detail.php?id=bootloader%3Astm32-hid-bootloader&media=assets:stm32_hid_bl_01.png