12Testing3

did you follow gadgets angels guide?

https://github.com/GadgetAngel/BTT_SKR_13_14_14T_SD-DFU-Bootloader/blob/main/bootloader_bin/backed_up_original_bootloaders/Octopus%20V1.1/Guide%20ST-LINK%20Utility%20on%20Windows%2010%20for%20ST-Link-V2-Clones%20for%20accessing%20STM32%20Processors.pdf