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並不會清除個人資料，但是通常升級後wipe cache可以解卡卡或是異常耗電
Wiping the Cache Partition:
In case your handset is not working correctly and you're considering master resetting, then you might want to try and wipe the cache partition before doing so. Wiping the cache partition will not remove personal data stored on your handset's internal memory.
1.While the device is powered on, press and hold the "Volume Up" and "Power" keys
2.Wait for the display to shut down and for your handset to vibrate once
3.Release the keys once that happened, then press the "Power" key to turn on your device
Read more: http://cellphoneforums.net/sony-ericsson/t362200-sony-xperia-z-master-reset-wipe-cache-partition-boot.html#ixzz32VhPqp4c
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