EBB 42 V1.2 bricked!

Hi all,
Here is my scenario. Manta M8P with CB1 + U2C + EBB 42 V1.2 .
Manta +CB1 with Klipper installed. U2C configured, and I tried to follow the BTT [Video](https://www.youtube.com/watch?v=GaMOe1yirPk) to install the firmware on the EBB 42 V1.2. Once the board was in DFU mode and connected to STM32 Cube Programmer, I clicked Download and got an error

`15:06:27 : STM32CubeProgrammer API v2.13.0 | Windows-64Bits

15:07:04 : Read File: \\Mac\Home\Desktop\klipper.bin

15:07:04 : Number of segments: 1

15:07:04 : segment[0]: address= 0x0, size= 0x67CC

15:09:29 : UR connection mode is defined with the HWrst reset mode

15:09:29 : USB speed : Full Speed (12MBit/s)

15:09:29 : Manuf. ID : STMicroelectronics

15:09:29 : Product ID : DFU in FS Mode

15:09:29 : SN : 204D39545542

15:09:29 : DFU protocol: 1.1

15:09:29 : Board : --

15:09:29 : Device ID : 0x0467

15:09:29 : UPLOADING OPTION BYTES DATA ...

15:09:29 : Bank : 0x00

15:09:29 : Address : 0x1fff7800

15:09:29 : Size : 68 Bytes

15:09:29 : Bank : 0x01

15:09:29 : Address : 0x1fff7870

15:09:29 : Size : 4 Bytes

15:09:29 : UPLOADING ...

15:09:29 : Size : 1024 Bytes

15:09:29 : Address : 0x8000000

15:09:29 : Read progress:

15:09:29 : Data read successfully

15:09:29 : Time elapsed during the read operation is: 00:00:00.025

15:09:31 : Memory Programming ...

15:09:31 : Opening and parsing file: klipper.bin

15:09:31 : File : klipper.bin

15:09:31 : Size : 25.95 KB

15:09:31 : Address : 0x08000000

15:09:31 : Erasing memory corresponding to segment 0:

15:09:31 : Not flash Memory : No erase done

15:09:31 : File segment @0x08000000 is not 255-bytes aligned. It will be aligned to @0x07FFFFF8

15:09:31 : Download in Progress:

15:09:31 : Error: failed to download Segment[0]

15:09:31 : Error: failed to download the File`

Now the board has the green and blue light (fainted) and I can't connect to it anymore. The cube programmer or the Manta M8P with CB1 don't see it anymore.
I don't know what to do...
Any help would be appreciated.
Thank you!

Start with the reported EBB 42 V1.2 setup, the Klipper binary, and the STM32CubeProgrammer log showing the failed download at 0x08000000. Reproduce the DFU connection and firmware-download sequence with the Manta M8P, CB1, and U2C; the issue is resolved when the board is again detected and can be connected to or programmed.

Written by the indexing model from the issue text.