see all you need is the stock rom .
and ygdp tool
and should know how to use it too
here is the stock rom with YG
1. Get the upgrade driver files;
2. Power the phone off and connect it to the PC via the data cable of standard configuration; the driver is not installed if it is the first time of upgrade; please install the driver manually, and specify the installation path to the position where the driver is located;
3. After the upgrade driver is successfully installed, the device driver port can be seen in Device Manager:
4. Configuration of Upgrade Platform
Flash tool setup must install first
Click on Next > Next > Next to finish installation
Flash tool shortcut will available on Desktop
Once click on above icon , Below error will appear click close the program
Right click on icon and go to properties
Go to compatibility > Enable below shown “ Run this program in compatibility mode for :”Select system OS , Ex: window 7 > click on Apply > OK
Now double click on Flash tool icon, below screen will appear, Enter Password: 369
REAL FLASHING
1. CLICK ON CONFIG
2.you should have unzipped the STOCK ROM.rar by this time now .
3.select the cpd file you have unzipped
4.now on the side bar a lot of model numbers are there but select only 8297 w!
5.click apply
6.now click start on the main screen
7.now connect the phone while it is completely off and connected via USB
8.the phone would be automatically detected and flash would happen
9.it would go on 1005 complete
Upgrade Successful
if i helped press thanks