I moved the question from http://stackoverflow.com/q/15872848/1665807
I have a rooted Huawei u8825d phone.I want to know if there were no apk files in "/system/app/" folder.
So,I moved these apk files from /system/app/ to internal sd-card.When I tried to reboot the phone,it didn't succeed.I hanged up with a white screen.
Then I tried to push the apk files from the internal sd-card into the /system/app/ folder by using "adb".
D:\MTH\update>adb devices List of devices attached 78F5FD6420D5 device D:\MTH\update>adb remount remount failed: Operation not permitted
Then,in another way,
D:\MTH\update>adb shell mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system mount: Operation not permitted
This is another way.
D:\MTH\update>adb shell shell@android:/ $ su su Segmentation fault 139|shell@android:/ $