Hi [NAME]-R,   Unfortunately, running the command systemerase, the iDRAC will execute a graceful system reboot. I also tried to check if there is any subcommand eg: -b NoReboot but there isn't any. Hence the execute reboot is automated.    [URL]
The output of racadm swinventory includes   What's a good way to purge old firmware / BIOS versions? This isn't just over-tidying; the inventory report seems to be confused about Current / Rollback / Available versions, so the simplest approach would be to just have the single latest version.
Purge old firmware versions from PowerEdge iDRAC