AB350 gaming K4 - BIOS

The files available are for use from Windows or Instant Flash you don't need to make the USB stick bootable just make sure it is formatted to FAT file system.

Step by step:

Place BIOS 3.4 on the USB stick along with BIOS 4.7.
Restart, enter the BIOS (referred to as the UEFI now)
Find the option for Instant Flash in the UEFI and enter it
Select your USB drive and select the 3.4 firmware file (you MUST flash this firmware first!!)
Once the update is complete the system will restart automatically
Now enter the UEFI again and head back to Instant Flash, select firmware 4.7
After the update and restart you are done

I currently have the BIOS Version 1.3 and I'm trying to update it. It says I need to update to the Version 3.0 in DOS mode and I have formatted my thumb drive and loaded the BIOS onto it. But, when I try do step 4 it has me looking in the C: drive (my SSD and only other drive) when I need to be in the E: drive (my thumb drive). So I type E: in the directory and it tells me that it is an invalid drive. If anyone has any idea why it says my thumb drive is invalid and how to fix it please comment.