Windows 10: CMOS 502 checksum invalid after usin dual boot.

I had earlier windows 11 and ubuntu on my hp laptop , ubuntu on dual boot. after installing ubuntu my computer showed me the " cmos checksum invalid 502. press enter to restart. " thing for like 5 seconds and after that my computer automatically restarted and booted into os. i thought it was due to dual boot so i formatted and wiped the disk ubuntu was in . ubuntu is gone but i still face the problem till day. like my system shows the error but restarts automatically and loads windows.

:)

 

CMOS Reset (502) + No Wifi Options + No Battery Charge

I have an HP Envy x360 Convertible running Windows 11 version 21H2 with the following issues:

• Boots to blue screen"CMOS Reset (502) The CMOS checksum is invalid" and then proceeds to normal OS except:
  
• Network & Internet will not detect any wifi network (though there are several available) Device manager shows intel(r) wifi-6 ax200 = This device cannot start (Code 10). Rollback Driver in device management is no longer an available option.
  
• Power detects the charger while connected but unit immediately loses power once disconnected.
  

Troubleshooting steps completed:

• Multiple hardware diagnostic tests with no indication of issue
  
• Rollback for drivers (doing this would allow an internet connection but power issues persisted)
  
• Complete factory reset & OS reinstall (locally, without USB)
  

What are my next steps to avoid unnecessary cost and/or further trial & error:

• Restore to new OS from USB?
  
• Go somewhere for more thorough hardware diagnostic?
  

Thank you !

 

CMOS Checksum error.

Please replace the CMOS battery and see if it makes a difference.

How to Fix a CMOS Checksum Error (lifewire.com)

 

CMOS Checksum error.

Recently I have started to face this problem, When i start my computer, it blacks out and restarts 2 times and then shows up CMOS checksum error and after which the computer boots successfully. can anyone help me fix this?