How to update with a beta firmware

[claustro]

Excuse me for my dumb question.
this is my setup

Board: Duet 2 WiFi (2WiFi)
Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 3.3 (2021-06-15)
Duet WiFi Server Version: 1.26

which files do I have to update if I would like to try the beta firmware

 Duet2CombinedFirmware.bin512 KB
 Duet2Firmware_SBC.bin438 KB
 Duet3Firmware_EXP1HCL.bin145 KB
 Duet3Firmware_EXP1HCLv0_3.bin145 KB
 Duet3Firmware_EXP1XD.bin113 KB
 Duet3Firmware_EXP3HC.bin129 KB
 Duet3Firmware_MB6HC.bin679 KB
 Duet3Firmware_MB6XD.bin667 KB
 Duet3Firmware_Mini5plus.uf21.4 MB
 Duet3Firmware_SAMMYC21.bin121 KB
 Duet3Firmware_TOOL1LC.bin128 KB
 Duet3_SDiap32_MB6XD.bin19 KB
 DuetMaestroFirmware.bin491 KB
 DuetWebControl-SD.zip8.66 MB
 Source code (zip)
 Source code (tar.gz)

Thank you

[dc42]

@claustro upload Duet2CombinedFirmware.bin and DuetWebControl-SD.zip.

[claustro]

@dc42 Thank you very much for this rocket-fast answer!