在恢复出厂设置的时候，如需要恢复GPRS counter,不需要使用callhistory的reset函数，请直接修改GPRScounter
NVRAM的属性即可，请参考：  

OLD: 

  , { 

  NVRAM_EF_CBM_CALL_HISTORY_LID, 

  NVRAM_EF_TCP_LAST_TOTAL_SIZE, 

  NVRAM_EF_TCP_LAST_TOTAL_TOTAL, 

  NVRAM_NORMAL(NVRAM_EF_ZERO_DEFAULT), 

  NVRAM_ATTR_AVERAGE, 

  NVRAM_CATEGORY_USER, 

  "MP90", 

  VER(NVRAM_EF_CBM_CALL_HISTORY_LID), 

  "CBM call history", 

  NVRAM_APP_RESERVED 

  }

修改成如下：  

NEW: 

  , { 

  NVRAM_EF_CBM_CALL_HISTORY_LID, 

  NVRAM_EF_TCP_LAST_TOTAL_SIZE, 

  NVRAM_EF_TCP_LAST_TOTAL_TOTAL, 

  NVRAM_NORMAL(NVRAM_EF_ZERO_DEFAULT), 

  NVRAM_ATTR_AVERAGE, 

  NVRAM_CATEGORY_USER | NVRAM_CATEGORY_FACTORY,//这里变了。。。 

  "MP90", 

  VER(NVRAM_EF_CBM_CALL_HISTORY_LID), 

  "CBM call history", 

  NVRAM_APP_RESERVED 

  }

  

  

      {

         NVRAM_EF_TCM_STATISTICS_LID,

         NVRAM_EF_TCM_STATISTICS_TOTAL,

         NVRAM_EF_TCM_STATISTICS_SIZE,

         NVRAM_NORMAL(NVRAM_EF_ZERO_DEFAULT),

         NVRAM_CATEGORY_USER,

         NVRAM_ATTR_AVERAGE,

         "MT47",

         VER(NVRAM_EF_TCM_STATISTICS_LID)

     },

  -->

       {

         NVRAM_EF_TCM_STATISTICS_LID,

         NVRAM_EF_TCM_STATISTICS_TOTAL,

         NVRAM_EF_TCM_STATISTICS_SIZE,

         NVRAM_NORMAL(NVRAM_EF_ZERO_DEFAULT),

         NVRAM_CATEGORY_USER| NVRAM_CATEGORY_FACTORY,//这里变了。。。

         NVRAM_ATTR_AVERAGE,

         "MT47",

         VER(NVRAM_EF_TCM_STATISTICS_LID)

     },