After BGMI Released the beta version many users facing problem with the game, its normal because it's not the public version. The game is only for testing.
If you have this problem follow the steps.
- Go to Android > data > com.pubg.imobile (This is the game folder of BGMI)
- Go to Files > UE4Game > ShadowTrackerExtra > ShadowTrackerExtra > Saved
- Again, go to Paks
- Search for files starting with game_patch
- You will get three files that start with game_patch in the Paks folder.P
- Select all three files starting with game_patch Long press on one of the files to start selecting