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我想确认下，新的BQ78Z100 需要做什么密码认证吗？还是默认直接就能用的；我在芯片手册上看到 芯片有 三个安全等级：There are three levels of secured operation within the device. To switch between the levels, different operations are needed with different keys. The three levels are SEALED, UNSEALED, and FULL ACCESS. The device also supports SHA-1 HMAC authentication with the host system. 芯片默认是哪个等级啊？ 切换等级 需要按键，这个按键是指什么？
