遇到需要将jar和so push到设备的情况，某些没有调整文件权限的设备可能会遇到
failed to copy ... Read-only file system 类似的提示。
对于root过的设备，可以按照如下的步骤修改文件的权限：
1.用 adb shell 命令进入到设备的文件系统；
2.用 su 命令切换到root用户（设备需要root）；
3.用 mount -o remount,rw -t yaffs2 /dev/block/mtdblock0 /system 重新挂载文件系统（如果没有这一步，即使修改了system文件夹的权限，也不能push成功）；
4.用 chmod 777 /system 修改相关文件夹权限。
5.try again and good luck
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