建議這種跨google版本的超大更新，最好是可以升級後重新回復系統會比較穩定一點，因為這種跨版本更新是有動到核心系統的，除非你非常了解整個系統架構跟運作方式還有你下載的所有app的運作方式，有辦法自行抓問題點；否則最好是回復系統會比較好!
會嫌麻煩的通常都是平常沒有備份習慣的，如果有備份觀念的話正常來講是不會嫌麻煩的。
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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