I followed the instructions posted here to enter the bootloader and successfully connect to the MCU via USB using STM32CubeProgrammer. When I attempt to load code the following error occurs:
09:12:45 : USB speed : Full Speed (12MBit/s) 09:12:45 : Manuf. ID : STMicroelectronics 09:12:45 : Product ID : DFU in FS Mode 09:12:45 : SN : 2061347F4852 09:12:45 : DFU protocol: 1.1 09:12:45 : Board : -- 09:12:45 : Device ID : 0x0495 09:12:45 : UPLOADING OPTION BYTES DATA ... 09:12:45 : Bank : 0x00 09:12:45 : Address : 0x1fff8000 09:12:45 : Size : 128 Bytes 09:12:45 : UPLOADING ... 09:12:45 : Size : 1024 Bytes 09:12:45 : Address : 0x8000000 09:12:45 : Read progress: 09:12:45 : Data read successfully 09:12:45 : Time elapsed during the read operation is: 00:00:00.004 09:13:33 : Memory Programming ... 09:13:33 : Opening and parsing file: xxx.bin 09:13:33 : File : xxx.bin 09:13:33 : Size : 507.16 KB 09:13:33 : Address : 0x08000000 09:13:33 : Download in Progress: 09:13:33 : Error: Write failed at address: 0x8000000 09:13:33 : Error: failed to download Segment[0] 09:13:33 : Error: failed to download the File 09:13:33 : RUNNING Program ... 09:13:33 : Address: : 0x08000000 09:13:33 : Error: Start operation failed 09:13:33 : Warning: Connection to device 0x495 is lost 09:13:34 : Disconnected from device. 09:13:34 : ST-LINK error (DEV_CONNECT_ERR)
I upgraded and also entered the bootloader from CDC_Standalone rather than from our full application. I was then able to load our application using STM32CubeProgrammer over USB.
