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On any BMS there will be a chip, sometimes 2, which are the brains of the operation. The TI bq-series are pretty common. Some of these have public documentation, some are private. A lot of them are password-protected if you want to overwrite the original programming. There are various tools for interacting with them, from free open source to paid You don't always need to reset it, sometimes just replacing the cells then shorting across the switching side of the output is enough. But without knowing what you're getting into it's a gamble.
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