Backstab HD Mobile Android Gameplay #3

My friend and I are from Iran and we love anime and we installed this game and our ping was high in this game. Note that Iran's internet is not good and I, who use Wi-Fi, do not have a good ping in any game compared to my friend who uses mobile internet, and I was surprised because my friend's ping was the same as mine. I realized that the problem is not with my ping. The problem is that this game does not have good support from Iran, because the ping of an Iranian in famous games like Call of Duty and PUBG is usually 70 to 100, but in this game it is usually 400. I tested it with mobile internet and it should be better than Wi-Fi. But it didn't matter, I don't have a good ping with Wi-Fi, but I had a good ping with mobile internet in Kalaf Duty

Why I can't download this??? Help please...

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Can someone tell me how to start