Recurring CMOS Reset (502) and BIOS Recovery (500) – OMEN 17-ck1000

[OMEN17_502Help]

I have an HP OMEN 17-ck1000 with an Intel Core i7-12800HX.

I’ve been getting CMOS Reset (502) and BIOS recovery messages intermittently for a while. This year, I’ve seen them around 2–3 times. Previously, I could press Enter, and the BIOS would recover successfully, allowing the laptop to start normally.

Because this kept happening, I decided to update the BIOS using HP’s official BIOS update utility. The update completed successfully, and Windows showed:

BIOS Version/Date: AMI F.23, 21/04/2026

The laptop then worked normally for around 2 days.

On September 6, 2026, during startup, I got a screen titled “HP BIOS Update” saying “The System BIOS is being recovered.” The recovery completed successfully, and I then got “BIOS Recovery (500) – A System BIOS Recovery has occurred.” I pressed Enter, and the laptop started normally.

After this, I shut the laptop down, unplugged everything, waited about a minute, held the power button for around 20 seconds, then plugged the charger back in.

After doing this, I received CMOS Reset (502): “CMOS checksum is invalid. The CMOS will be reset to the default configuration, and the computer will restart.” I pressed Enter and was still able to start the laptop normally.

I’m concerned because these messages keep coming back despite the BIOS update to F.23 completing successfully. I’m getting tired of having to deal with these recovery messages and would like to know what the recommended permanent solution is.

Is there a specific HP diagnostic or recovery procedure I should perform?

Edit: I also checked the battery health using HP Support Assistant/HP diagnostics, and it showed as Normal. I’m mentioning this in case the battery condition is relevant to the recurring CMOS/BIOS recovery issue.

[Deep_World]

Hi  @OMEN17_502Help 
 
Welcome to the HP Support Community!

Thanks for reaching out!

Thank you for providing such detailed information about your OMEN 17-ck1000. I can understand why you're looking for a permanent solution, especially since the BIOS Recovery (500) and CMOS Reset (502) messages have reappeared even after successfully updating the BIOS to version F.23.

To help us narrow down the cause, could you kindly confirm the following:

• When the BIOS Recovery (500) occurs, does it happen only during startup, or have you seen it after waking the system from sleep or hibernation as well?
• Have you noticed whether the date and time in the BIOS or Windows ever reset after receiving the CMOS Reset (502) message?
• Are you using the original HP AC adapter that came with the notebook?
• Have any hardware components been replaced or upgraded since purchase, such as memory (RAM), SSD, battery, or motherboard?

Based on the symptoms you've described, I would recommend the following checks:

1. Run HP Hardware Diagnostics UEFI - click here for steps

Even though the battery health reports as Normal, it would be helpful to perform a full hardware test.

1. Turn off the notebook.
2. Power it on and repeatedly tap F2.
3. Open HP Hardware Diagnostics UEFI.
4. Run: 
   • System Tests > Extensive Test
   • Memory Test
   • Battery Test

Kindly note any failure IDs if any are reported.

2. Restore BIOS Defaults

A corrupted BIOS configuration can sometimes trigger recurring CMOS checksum errors.

1. Turn on the notebook and repeatedly tap F10.
2. Enter BIOS Setup.
3. Select Load Setup Defaults (or Restore Defaults).
4. Save changes and exit.

3. Perform an HP BIOS Recovery  - click here for steps

Since the system has already initiated self-recovery multiple times, manually performing a BIOS recovery may help ensure the BIOS image is properly rewritten.

1. Turn off the notebook.
2. Hold Windows + B keys.
3. While holding those keys, press and hold the Power button for 2-3 seconds.
4. Release the Power button but continue holding Windows + B until the BIOS Recovery screen appears.

You can refer to HP's document: https://support.hp.com/us-en/document/ish_3932413-2337994-16

4. Check for CMOS/RTC Related Issues

Recurring CMOS Reset (502) messages can sometimes indicate that the system is losing BIOS settings unexpectedly. If the issue continues after the above steps, HP may need to evaluate the RTC/CMOS circuitry or system board hardware.

Since you've already updated to BIOS F.23 and the recovery messages continue to return intermittently, I would be particularly interested to know whether the system date/time ever resets and whether any hardware changes have been made. Those details can help determine whether we're looking at a BIOS image issue or a hardware-related condition affecting the system board.

I hope this helps.