I. Preparations:
- Copy the BIOS update files to root folder of the USB drive (drive should be formatted with FAT32).
- Insert the USB drive to one of the YB3x USB sockets.
- Attached a serial cable and run a terminal program such as putty etc..
- Power on the YB3x.

II. BIOS update:
- At the system prompt, type "FS0:" and press <Enter>
- “ls” will list the files in the USB drive. One of the files will be “bios_?????.efi” where ????? represent the bios version string.
- Type “bios_” and hit the <tab> key (the system will complete to bios update file name.). Press <Enter> and watch the BIOS update.
-wait until completion - (please be noted - system will restart several times during the update)
- Remove The USB drive
- After each BIOS update there will be a new "memory train" process. It is a one-time processes. While at it, a red LED will contentiously lit. Do not power down the system! This process might take 5..8 minutes.
