Because of the SSID change in the new BIOS, you will need to flash the BIOS to X9SKV_x.ROM temp. version before proceed to X9SKV4.123 version 2.0a BIOS.
Please follow following step to flash BIOS:

1. extract the files to a DOS bootable device
2. Boot to DOS prompt and type flash X9SKV_x.ROM
3. Do not interrupt the process until the flashing is complete
4. Reboot to the same DOS device 
5. type flash X9SKV4.123 
6. Do not interrupt the process until the flashing is complete
5. After you see the message of BIOS has completed the update, unplug the AC, clear the CMOS and plug in the AC and power on the system.
6. Go to the BIOS setup screen and press F9 to load the default and press F10 to save and exit.