Can you send M122 and post the response so we can see what's actually installed?
Or for the sake of simplicity, just upload the full 2.05 update followed by the 3.0 update, followed by the 3.01_rc11 update one at a time.
Upload the entire zip file without extracting it. It should be detected and all the relevant firmwares updated as needed along with the compatible DWC version. This will ensure you have all the iap files, etc needed.
https://github.com/dc42/RepRapFirmware/releases/download/2.05/Duet2Firmware-2.05.zip
https://github.com/dc42/RepRapFirmware/releases/download/3.0/Duet2and3Firmware-3.0.zip
https://github.com/dc42/RepRapFirmware/releases/download/3.01-RC11/Duet2CombinedFirmware.bin
https://github.com/dc42/RepRapFirmware/releases/download/3.01-RC11/DuetWebControl-SD-2.1.6.zip