How to reset a laptop BIOS with no CMOS battery?

Solution 1:

See this page, create recovery usb and insert it, then power up, it should recover the bios automatically.

The ASUS CrashFree BIOS 3 utility is an auto recovery tool that allows you to restore the BIOS file when it fails or gets corrupted during the updating process. You can restore a corrupted BIOS file by using the motherboard-support CD or a USB flash drive that contains the latest/original BIOS file.

1. Turn on the system.
2. Insert the motherboard-support CD to the optical drive, or the USB flash drive which contains the BIOS file to the USB port.
3. The utility automatically checks whether the BIOS file is saved in the device. When the BIOS file is found, the utility starts to read the BIOS file and automatically enters ASUS EZ Flash 3.
4. The system requires you to enter the BIOS Setup to recover the BIOS settings. To ensure the system compatibility and stability, we recommend that you press to load the default BIOS values.

Note: DO NOT shut down or reset the system while updating the BIOS! Doing so can cause system boot failure!

• CrashFree BIOS 3 program is built into the BIOS, you don't need to install the additional programs.
• Availability of CrashFree BIOS 3 program depends on whether the motherboard specifications are supported.