Finally figured it out and the answer is dumb . First download gfx tool from playstore (one that always works )
For this you need the following :
This one for gfx tool
https://play.google.com/store/apps/details?id=eu.tsoml.graphicssettings&hl=en&gl=US.
Files > https://play.google.com/store/apps/details?id=com.marc.files&hl=en&gl=US
And the package name of pubg(com.tencent.ig) / bgmi (com.pubg.imobile)[without the brackets]
If you are here , then definitely you have used this app but it didnt work but that is not the app problem , it is an android limitation .
Now the Solution
1. Open the app and change all the usual settings to your preference.
2. Then click the accept button once.
3. After the ad finishes , and you get to the run game button . Close the APP but dont click it .
4. Now open the files app ( the one given above ) , go to Android folder which should be in internal storage(where your device name is written)
5. Inside the Android folder should be data and obb .
6. Go inside data and rename the package name to something else but copy the original one to clipboard.
7. Go inside obb and rename the package name to something else but copy the original one to clipboard.
8. Clear the data of pubg /bgmi from app settings .
9. rename the name of the folders you changed to their original name .
10. Launch the game and enjoy .
You have to do this everytime you launch the game and if you dont want to curse Google.
For this you need the following :
This one for gfx tool

Files > https://play.google.com/store/apps/details?id=com.marc.files&hl=en&gl=US
And the package name of pubg(com.tencent.ig) / bgmi (com.pubg.imobile)[without the brackets]
If you are here , then definitely you have used this app but it didnt work but that is not the app problem , it is an android limitation .
Now the Solution

1. Open the app and change all the usual settings to your preference.
2. Then click the accept button once.
3. After the ad finishes , and you get to the run game button . Close the APP but dont click it .
4. Now open the files app ( the one given above ) , go to Android folder which should be in internal storage(where your device name is written)
5. Inside the Android folder should be data and obb .
6. Go inside data and rename the package name to something else but copy the original one to clipboard.
7. Go inside obb and rename the package name to something else but copy the original one to clipboard.
8. Clear the data of pubg /bgmi from app settings .
9. rename the name of the folders you changed to their original name .
10. Launch the game and enjoy .
You have to do this everytime you launch the game and if you dont want to curse Google.