Cmos checksum bad1/9/2024 They do not last indefinitely, all batteries can only be charged so many times before they start dying, holding less and less power, and then eventually cannot be charged at all. if not, and it is for sure soldered in, you will need someone with skills to replace it for you Maybe the holder or clip is yes, but the battery should be able to be replaced. It’s not soldered in, no one would do that. BIOS is resetting to old date and fail safe settings once you remove power due to dead or faulty/low CMOS battery.įlashing BIOS will not cause this, of course sometimes after a flash you may see same or similar message, due to CMOS settings are purposefully destroyed and you should always load optimal defaults once you get into BIOSīut the symptoms you described at start = faulty/low/dead CMOS battery Yes, you know the real problem, and it’s only that! Your first comment means CMOS battery is dead, replace with new CR3023 battery. It resumed just like nothing happened without an error (and I even have screenshots with timestamps so I'm sure CMOS date wasn't reset.) I even remember hibernating the windows and unplugging everything for doing cleanup stuff on hw. I'm reasonably sure it didn't have this issue before messing with various BIOS jobs. I was actively using this laptop before starting any of these modding stuff. I know the situation screams IT'S A DEPLETED CMOS BATTERY. I tried various flashing options of Winphlash (clear cmos, don't clear cmos, preserve DMI, renew DMI etc.) I re-flashed the original unmodified bios again and again Changing bios settings, saving, restoring defaults etc. Issue only appeared after messing with bios ![]() Before flashing them I also exercised the Crisis recovery method with phlash16.exe (I've had a thread on that How can I change values in *.wph bios platform configuration file) cmos battery is in a very inconvenient place 2. I know the best way to check for the battery fault is actually changing it, but unfortunately 1. Would it be the reason for the checksum errors instead of a faulty CMOS battery? Is it possible that Crisis flashing (or winphlashing modded bioses) somehow "borked" some checksums in some CMOS are that are not touched by regular flashing? If I don't unplug error message doesn't appear. 0251: System CMOS checksum bad - Default configuration usedĪfter that it starts fine.
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