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我升级之前把一个20字节的buf利用SNV写到flash，SNV_ID 为0x82。上电初始化会读取该ID。
可是升级后发现读取回来数据是全零，这是为什么？？？？？
平时不升级，就断电后重启，能正确读取到断电前的数据。
