How do I fix a bad BIOS checksum?

How to Fix CMOS Checksum Errors

  1. Restart the computer. A normal restart usually creates a new checksum and eliminates the error.
  2. Download and flash a BIOS update. Download the update from the motherboard manufacturer’s website.
  3. Reset the BIOS.
  4. Replace the CMOS battery.
  5. Consult a technician or computer repair expert.

What is a bad checksum error?

Checksum is a system by which a computer can verify the contents of a file against a known record, ensuring that the contents are correct and undamaged. A bad checksum error results when the file fails this check, meaning that some part of the data no longer corresponds to the original.

Is CMOS checksum error bad?

If the system repeats the error message, follow the corrective action for the error message. CMOS checksum is bad, possibly because the system was reset during BIOS boot or because of a dead RTC battery. Reboot the system. If the problem persists, replace the RTC battery.

What causes checksum errors?

The most common cause of a checksum error during the startup process is a faulty battery that is not providing sufficient power to the motherboard when the computer is off. However, motherboard malfunctions and viruses can also contribute to checksum errors.

How do you fix a CMOS battery problem?

How to Remove and Replace the CMOS Battery in your Laptop

  1. Shut down your laptop and unplug from its power source, i.e., charger or battery.
  2. Flip your laptop over and remove the screws one by one by Phillips or Flathead screwdrivers. Check on the internet which one will do your work.

What does CMOS checksum bad mean?

The CMOS Checksum Bad Error is an error that occurs when the CMOS values turn out to be incorrect. The CMOS memory stores a specific value normally to guard the BIOS software. Each time the computer is booted, this value, which is a number is checked against the stored value in the CMOS memory.