R740 server firmware recovery methods?

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: https://www.dell.com/support/kbdoc/zh-tw/000128194/updating-firmware-and-drivers-on-dell-emc-poweredge-servers?lang=en

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?