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- HP Community
- Notebooks
- Notebook Operating System and Recovery
- CMOS CHECKSUM INVALID

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07-20-2025 12:00 AM
Please I have been using my laptop for up to 3 years now and I just changed the battery because it's gone bad (my laptop switches off around 60%).
Now immediately after changing the battery, I'm getting the "CMOS CHECKSUM INVALID" error message. I have browsed, it's said my laptop main battery also serves as the CMOS battery. The guy that repaired the battery for me said I need to flash the laptop.
For now, I use F10>boot options>legacy support... to boot my system.
The guy changed my keyboard (island style), screen open/close hinges and battery. So he practically dismantled my system. Even my Bluetooth is no longer available, though I plan to use external one.
My laptop: HP Notebook - 17-by0104ng
Check out the laptop here: https://support.hp.com/bg-en/document/c06057432
Please I need help now. Thank you.