Solution:
The priority system files are modified after root to resolve the problem by swapping the built-in, external memory cards.
Action method:
1. Download and install through the computer "Baidu one key root" PC version address: http://root.baidu.com/home.html
2. Open the development mode of the red rice handset and turn on the USB debugging option
The specific actions are:
Click on the phone set → all set → about mobile phone
Click "Android Version" multiple times until you are prompted to "open developer Options", and then press the return key to exit the "Settings" menu and return to the main screen
Click the phone again settings → all set → developer options
Turn on USB debug mode and return to the standby interface
3. Connect a mobile phone to a computer with a data cable
4. Watch the phone's ScreenTip and follow the prompts
5. Open the computer "Baidu one key Root" program
6. Click "Start Root" in the computer
7. Look at the prompts on the phone screen and follow the prompts (very important!) ）
If you do not operate on the phone will cause root failure, there is no other effect. Restart the phone and computer after restarting from Tutorial Step 3 for root.
8. Mobile phone restart complete appear "Baidu One key Root" icon, click to view the root has been successful
9. Through the Millet application Mall download Installation "Re File Manager" (recommended to connect Wi-Fi download or download through the computer installation)
10. Start "Re File Manager" and click "Mount r/w"
Hint: When the content changes to "mounted as r/w" represents just the successful operation
11. Click "etc" → find "vold.fstab" and long press → select "Open in Text Editor"
12. Find the file Dev_mount sdcard/storage/sdcard0dev_mount sdcard2/storage/sdcard1
Delete the number behind the sdcard and change it to (see screenshots, make sure not to change other content)
Dev_mount Sdcard/storage/sdcard1dev_mount sdcard2/storage/sdcard0
Click "Save and Exit" on the screen after clicking the Entity key Option key (three bars)
At this point you can see the automatically generated Vold.fstab.bak backup file, which represents just the successful operation.
The memory card has been swapped successfully only when the phone is restarted.
Special Note: If the next time you make a system update, please change the storage space and turn off root permission to upgrade 1. Please restore the replacement storage space by "RE manager" (that is, follow step 12) To change the contents of Vold.fstab back to Dev_mount Sdcard/storage/sdcard0dev_mount sdcard2/storage/sdcard12. Open the phone "Baidu one key root" software, the root permission to close
