BIOS downgrade issue

[Himanshu102]

Hi guys, i get a issue on my screen : cmos checksum is invalid and cmos reset(502) image is attached below for reference, i just visit on hp support but there is no BIOS update for my laptop and i saw update for window 11 64 bit (22) but mine is (24), and just for experiment i install 22 and now its give me issue like when click window button for search calculater or searh any option its show color screen then ti remove image icones, app icons, and other issues,  My old comos version is : AMI F.33, 04-10-2023, and after update its now AMIF.39, 18-04-2025, how to solve this issue?This issue appear on screen

[Garp_senchau]

@Himanshu102, Welcome to HP Support Community,

Thank you for posting your query; I’m here to help by guiding you through steps to resolve this issue

During the startup process, the system performs a checksum test of the BIOS. If the checksum is incorrect, the BIOS is assumed to be corrupt and the system installs a hidden copy of the BIOS to correct the problem, and the startup process continues. The following message displays for 15 seconds before the computer automatically reboots. You have the option of pressing enter to proceed without waiting 15 seconds.

To resolve the CMOS Reset Error (502), follow this guide: HP PCs - 500, 501, or 502 error displays on a black screen | HP® Support

I hope this helps.

Please feel free to reply here if you have any questions or if you need further clarification on any of the steps. 

Take care and have a good day. 

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