Jumper & Switch Setting - Biostar Z490GTA EVO User Manual

2.6 Jumper & Switch Setting
The illustration shows how to set up jumpers. When the jumper cap is placed on pins, the jumper
is "close", if not, that means the jumper is "open".
Pin opened
JCMOS1: Clear CMOS Jumper
The jumper allows users to restore the BIOS safe setting and the CMOS data. Please carefully
follow the procedures to avoid damaging the motherboard.
Clear CMOS Procedures:
1. Remove AC power line.
2. Set the jumper to "Pin 1-2 close", you can use a metal object like a screwdriver to touch the
two pins.
3. Wait for five seconds.
4. After clearing the CMOS values, be sure the jumper is "Pin 1-2 open".
5. Power on the AC.
6. Load Optimal Defaults and save settings in CMOS.
BIOS_SW1: Dual BIOS Switch
The Dual BIOS Switch allows you to choose one of the BIOS ROMs (ROM1A/ROM2A) for boot up.
Note
» Do not use this switch when your system is power-on.
» Before flashing BIOS ROMs, please make sure this switch is set to the BIOS ROM which you want to
update.
14 | Chapter 2: Hardware installation
Pin closed
Pin 1-2 Open: Normal Operation (Default)
Pin 1-2 Close: Clear CMOS data
Pin 1-2 closed
Main BIOS (ROM1A) Enabled
The LED indicator (ROM1_LED1) will light
and the Main BIOS is enabled.
Backup BIOS (ROM2A) Enabled
The LED indicator (ROM2_LED1) will light
and the Backup BIOS is enabled.