1) Already have been updated to the most recent BIOS by the manufacturer?
depends if the motherboard was manufactured after the latest BIOS update
2) Will it automatically ask me to update the BIOS when I install the CPU?
no. a bios does not have "automatic" updates.
3) Will I need to boot with an older CPU, update the BIOS, then dismantle, attach the new FX CPU and boot it up once again?
depending on question 1, yes. but boot into your operating system before shutting down to install your new cpu.
fully read the instructions on how to "flash" your bios on the asus web site before doing so.
Thanks in advance - Neffian.
hope i helped.