Yes, it's acceptable to install Windows first and then update the BIOS.
Yes, it's acceptable to install Windows first and then update the BIOS.
Considering if it's acceptable to set up Windows first and then update the BIOS directly on the PC. You already have Windows 11 installed on your USB drive, so you're not planning to remove it. You'd like to apply the BIOS updates from the computer itself before installing the operating system.
You're free to include a folder for the bios file. It doesn't need to be a dedicated drive either.
Ensure your existing BIOS can handle the CPU you're using; otherwise, install the BIOS first. You might see a warning about resetting the TPM, but it shouldn't affect you if Windows wasn't installed with Bitlocker enabled (likely only on Pro editions).
BIOS is the firmware for your motherboard. It doesn't belong to Windows and isn't installed alongside it like a driver for your GPU would be. Sometimes it displays your board as brand new and asks you to reactivate in Windows. However, apart from that, they remain separate.