Firmware update - Best Practices

Hi,

Tomorow, I should receive the replacement motherboard for my R720. I expect a long run to update all firmwares. But I would like to know the best practice to update all firmwares.

Is it better to updates drivers at the latest version immediately or we must follow an update path ?

Is it better to update BIOS first ? or iDRAC ? or it does not matters ?

Is it better to update each firmware manually or to boot with the ISO update tools (Platform Specific Bootable ISO) ?

I'm concerned about this update methodology and I don't want to brick my board with this process.

Thanks for all your advices