Flash nRF52840 dongle with Sweyntooth firmware

Hi, I was trying to flash the sweyntooth firmware to nRF52840 dongle using nRF connect for desktop. I was following the instruction on in this tutorial:  nRF52840 Dongle Programming Tutorial . The hex file I used was provided in github https://github.com/Matheus-Garbelini/sweyntooth_bluetooth_low_energy_attacks?tab=readme-ov-file, however they didn't provide which SoftDevice that is required and when I write the hex in DFU mode I keep getting this error: 

Any idea on solving this issue?

Thank you,

David

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