OTA下載的檔案在哪裡？
首先，遇到的第一個問題就是TWRP；是的，在上一篇[科技新知][Android] 如何Root Nexus5 (以版本號碼: KTU84P為例)中，就已經把手機的Recovery換成TWRP。
當按下重新啟動並安裝之後，重開機看到TWRP的時候就傻了，因為得要自己選擇要安裝的zip檔案。查了很久，才終於知道OTA下載的檔案都會放在/cache目錄下。當然，你得要Root才看的到。
選了該檔案安裝以為就可以順利了嗎？ No no...非經一番寒徹骨、哪得梅花撲鼻香。就讓我們繼續看下去...
TWRP error flashing zip file....
關於這個問題，網路上說是因為SuperSU造成的問題，也提供解法，不過我測試倒是一直失敗。山不轉路轉，就改成手動安裝吧。
注意：按照以下方式會把手機上的資料都刪掉，操作前，請一定要先備份重要資料。
手動安裝Lollipop
首先，請先到這裡下載安裝包，MD5 checksum為761667f1ddaf4e38d4792136df4ab927，點選Link就開始下載囉，檔案名稱為hammerhead-lrx21o-factory-01315e08.tgz。
下載完成後，請按照以下步驟
- 將檔案解壓縮至adb以及fastboot的相同目錄，預設應該是{Android_SKO}/platform-tools
- 手機開機到bootloader (先關機後，同時按Volume - (減少)和電源鍵)
- double-click flash_all.bat即可
當然世界沒那麼美好，此時有可能會遇到以下的錯誤訊息
target reported max download size of 1073741824 bytes
archive does not contain 'boot.sig'
archive does not contain 'recovery.sig'
failed to allocate 1005154516 bytes
error: update package missing system.img
解決"failed to allocate 1005154516 bytes"
還好，天無絕人之路，請將目錄下的image-hammerhead-lrx21o.zip，解壓縮在相同目錄，裡面應該包括：android-info.txt、boot.img、cache.img、recovery.img、userdata.img和system.img。
之後，修改flash_all.bat，原始內容如下：
@ECHO OFF :: Copyright 2012 The Android Open Source Project :: :: Licensed under the Apache License, Version 2.0 (the "License"); :: you may not use this file except in compliance with the License. :: You may obtain a copy of the License at :: :: http://www.apache.org/licenses/LICENSE-2.0 :: :: Unless required by applicable law or agreed to in writing, software :: distributed under the License is distributed on an "AS IS" BASIS, :: WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. :: See the License for the specific language governing permissions and :: limitations under the License. PATH=%PATH%;"%SYSTEMROOT%\System32" fastboot flash bootloader bootloader-hammerhead-hhz12d.img fastboot reboot-bootloader ping -n 5 127.0.0.1 >nul fastboot flash radio radio-hammerhead-m8974a-2.0.50.2.21.img fastboot reboot-bootloader ping -n 5 127.0.0.1 >nul fastboot -w update image-hammerhead-lrx21o.zip echo Press any key to exit... pause >nul exit
修改如下：
@ECHO OFF :: Copyright 2012 The Android Open Source Project :: :: Licensed under the Apache License, Version 2.0 (the "License"); :: you may not use this file except in compliance with the License. :: You may obtain a copy of the License at :: :: http://www.apache.org/licenses/LICENSE-2.0 :: :: Unless required by applicable law or agreed to in writing, software :: distributed under the License is distributed on an "AS IS" BASIS, :: WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. :: See the License for the specific language governing permissions and :: limitations under the License. PATH=%PATH%;"%SYSTEMROOT%\System32" fastboot flash bootloader bootloader-hammerhead-hhz12d.img fastboot reboot-bootloader ping -n 5 127.0.0.1 >nul fastboot flash radio radio-hammerhead-m8974a-2.0.50.2.21.img fastboot reboot-bootloader ping -n 5 127.0.0.1 >nul fastboot flash system system.img fastboot reboot-bootloader ping -n 5 127.0.0.1 >nul fastboot flash userdata userdata.img fastboot flash recovery recovery.img fastboot flash boot boot.img fastboot erase cache fastboot flash cache cache.img fastboot reboot echo Press any key to exit... pause >nul exit
最後，再次雙擊flash_all.bat，應該就搞定啦。接著就可以好好享用棒棒糖啦。
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