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网上有华为C8815内置sd卡分区，但并不详细，如果看了，掉坑里了
简单
下载官网C8815固件（C8815,Android 4.1,Emtion UI 1.0,V100R001C92B140,中国电信）.zip 重新恢复系统即可
然后，如果还想刷：
1。安装adb驱动
2。进入手机“设置→开发人员选项 → 〖勾选〗保持唤醒状态.USB调试.允许模拟地点,关闭快速开机
3。用root软件root掉
4。下载hw_c8815-onekeytools.exe，运行，安装中文Recovery(建议跳过，不要轻易用中文Recovery格式化，而是用busybox mkfs.ext2)
5。继续参考网上华为C8815内置sd卡分区教程，过程中如果
a.遇到没权限,su root
b.fdisk没发现，安装busytool
我的步骤
1。root
2. 安装busybox
3. adb shell
4. reboot recovery
5. adb shell
6. su root
7. fdisk 分区(
我的
Disk /dev/block/mmcblk0: 3959 MB, 3959422976 bytes
1 heads, 16 sectors/track, 483328 cylinders
Units = cylinders of 16 * 512 = 8192 bytes
最后一个分区 338945 483328 1155072 6b unknown)
t 19 6b
/dev/block/mmcblk0p17 60417 191488 1048576 83 Linux
/dev/block/mmcblk0p18 191490 444928 2027512 83 Linux
/dev/block/mmcblk0p19 444930 483328 307192 6b Unknown
8. df
Filesystem Size Used Free Blksize
/dev 378M 64K 378M 4096
/system 1009M 956M 52M 4096
/data 1G 204M 930M 4096
9. busybox df -h
Filesystem Size Used Available Use% Mounted on
tmpfs 378.4M 64.0K 378.4M 0% /dev
/dev/block/mmcblk0p17
1009.3M 956.5M 52.8M 95% /system
/dev/block/mmcblk0p18
1.1G 204.6M 930.9M 18% /data
10. busybox umount /dev/block/mmcblk0p18
11. mkfs.ext2 /dev/block/mmcblk0p18
mkfs.ext2 /dev/block/mmcblk0p18
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
73728 inodes, 294912 blocks
14745 blocks (5%) reserved for the super user
First data block=0
Maximum filesystem blocks=4194304
9 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376
12. mount -t ext4 /dev/block/mmcblk0p18 /data
13. df
df
Filesystem Size Used Free Blksize
/dev 378M 64K 378M 4096
/system 1009M 956M 52M 4096
/data 1G 20K 1G 4096
14. 双清
15. reboot
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