R760 updating firmware - windows

Hello

We have a requirement to update a few R760 servers to a consistent firmware level prior to installation of windows 2022. 

The repository creates successfully and the components are downloaded, Upon exporting to a "Smartbootable ISO" it fails with "Selected repositories/bundles are not valid for this deployment". 

The exporting to a exporting to a "Smartbootable ISO" for the Linux servers, we had had no issues and the serves updated. It seems only Linux can export to a "Smartbootable ISO"

If some one had the similar issue please advise the steps..  

many thanks