How to overcome the failure of data wipe? My smartphone's type is Huawei g730 - U 10
Common issue with Huawei devices. This happens when the memory chip (eMMC) is damaged and become read-only. 
This is a hardware failure, the only fix is replacing the chip or changing the motherboard. Sometimes heating the chip can solve (temporarily) the issue. 

To be sure the eMMC is damaged, power off the phone, hold volume up and volume down at the same time then briefly hit the power button: if the screen goes purple or you get a more explicit message : Update exception. EMMC is readonly, you can't update your system - the chip is damaged. Otherwise you can flash the device to solve the issue.