The CMOS battery isn't something you'll need to change often. But when it goes, it's time for a quick swap.
The Alienware m16 R2 is a “do it all” 16-inch laptop for gamers who also want a portable PC with good battery life. It delivers strong RTX 4070 GPU performance with a capable, compact cooling system ...
There's several links provided by that answer which detail how to recover a Dell laptop from a corrupted BIOS update.
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