iLO 4 has detected a self-test error. For details, consult the <F9 = Setup> iLO 4 Server and iLO 4 Diagnostics page.
From the web interface's iLO event log:
Critical - Embedded Flash/SD-CARD: Error writing media 0, physical block 4: SMSC USX2065 unexpected command (out of sync?). Critical - Embedded Flash/SD-CARD: Error writing media 0, physical block 4: Timeout.
(etc.)
From the web interface's diagnostics tab:
Embedded Flash/SD-CARD - The AHS file system mount failed with (No such device)