Download and install the Android USB Drivers on your Computer. If Android Drivers is already installed on your computer then Skip this Step.

YGDP Tool

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Download

Password is 369,

Start YGDP and enter password

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Click on Config button

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1. Choose your phone (8297w)

2. Open stock ROM (CPB format) that you downloaded

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Apply your selection

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Wait few minutes for your ROM to unpack. Click on Start button

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Turn on debugging, turn off Quick Boot in settings (or take out and return the battery), turn off the phone and connect it to PC / Laptop

Wait for YGDP Tool to finish the flashing procedure

You are done :D