Download latest Android KitKat 4.4 stock firmware for Uhappy UP57 smartphone from here or from here.
Firmware image file: 20141226_e2709v82_jbla198_UP570
Model： Uhappy UP570 smartphone
Image file size: 425 MB
Platform: Mediatek MT6582
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.