@lwsmiser I just put these sample files to check the board could read the MicroSD files. During my tentatives to flash the board: I left just one file (firmware) on MicroSD card.
I renamed the Micro SD firmware file using different names:
Same result: The update process has not started. The .bin wasn't renamed to .cur.
If the Board unit doesn't have a working bootloader: It's impossible to update the firmware using the MicroSD card.
Using Creality website firmware = fail
Compiling my Marlin version = fail
Unfortunately, this board doesn't have an ISP Pin.
Also, I have the Silent Board (1.1.5 version): it's a piece of cake to update this board.
Maybe I am unlucky and I will ask to Creality replace this bootloader damaged board.