Hello,   You can use the iDRAC and LCC both to update and rollback firmware. This can sometimes correct any issues encountered with firmware updates, but it isn't a 100% guaranteed fix. 
I'm planning to update some f/w such as NIC, BIOS, HBA...etc for the R740 server via iDRAC9 GUI. Got articles about updating f/w: [URL]   I would like to know if disasters happened when updating firmware, Can I just use iDRAC to update firmware again to recover? is using iDRAC (to update firmware again) powerful enough to recover the failed firmware update? is using racadm cli, Platform-Specific Bootable ISO, Dell EMC Server Update Utility ISO and Lifecycle Controller also efficient methods to apply update for saving the failed firmware update back?
R740 server firmware recovery methods?