flasg esp unexpected error

[manos nikitas]

Hello guys i bought the KC868-a8 followed the tutorial i saw on youtube and when i tried to flash the esp as intructed i get the following error:|

Changing baud rate to 1500000
Changed.
- Flash Size: 4MB
Unexpected error: Error while retrieving firmware file 'https://raw.githubusercontent.com/Jason2866/ESP_Flasher/factory/bootloader/esp32/bin/bootloader_dout_40m.elf': 404 Client Error: Not Found for url: https://raw.githubusercontent.com/Jason2...ut_40m.elf

any ideas? thanks