Hi,
Hope everything is going well.
1,For task sequence OSD issue, it's firstly recommended to review the smsts.log and smspxe.log to check for further information.
2,Issue could be related to missing network and\or storage drivers in WinPE. Please try to add the Dell network and storage drivers to your boot images and then update your distribute points.
3,We can also turn off RAID and switch to ACHI in the BIOS to have a try.
Feel free to contact me if you have any concerns/queries.
Best regards,
Simon
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