If OSA has been erased or corrupted, you can download the image file that is available from the My Oracle Support web site and restore it to the USB device.
Download the image that is specific to your server from this location:
Burn the ISO image file to a physical CD/DVD.
Make the ISO image file available on the server as a boot device.
This action starts the recovery program. After the program verifies that the OSAUSB device is valid, a recovery continuation prompt appears.
The recovery process begins. When the recovery is finished, the server reboots and starts OSA.