Can't get passed Setup Wizard after Factory Reset cause Google Play Services keeps stopping! after Factory Resetting my Lenovo Tab 2 A8-50F Tablet with Android 5.1 i can't get passed the Setup Wizard after selecting the WIFI you want to connect it.. After Checking the Connection then it's doing a Software Update then Google Play Services keeps stopping every time, then revert me back to the WIFI selection screen and loops again and again. What can i do to fix this?
i tried Resetting it again but no luck and there is no option to Clear the Cache from the Boot Menu!!!
Well, this is probably a corrupted system files resulted from the reset. Flashing the firmware should solve  this.

Depending on the hardware platform, you'll need tools to flash the device. This phone comes with two variants: the one with Qualcomm chipset and the other with Mediatek chipset. 

For your case the chip is a Mediatek MT6735 , you need SP Flash tool and ROM file for the phone exact model. Don't forget to install Mediatek USB and Preloader drivers otherwise the device won't be determined by the computer. Then follow the flashing process.