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我在使用bq784XX Evaluation中，把Unseal Device设置成了Level 2，现在不知道如何改回来，我看是要输密码，但是不知道密码是多少 ！
http://www.ti.com/lit/ds/symlink/bq78412.pdf
参照page 25 "Unsealing the bq78412".
Level1 和 Level 2 的password 默认应该均为0xffff ffff
