UCM ISO File Issue

[infonaut]

Hi All,
Trying to downgrade UCM V2 iso files from Rls 10.0.0.5 to Rls 9.1.9 via Web Manager
however receiving error transfer operation failed.
See Attached document.
Also tried downgrade via USB however in System Status Application click USB Boot tab is not showing up,
The start up and shutdown tabs are showings.

 

[sizbut]

As far as I'm aware ISO downgrades are not possible except for a full reinstall.

Stuck in a never ending cycle of file copying.