its automaticly activated bro, no need to activated, i will note it in the thread
*if you curious how many i've added firerate, you can try get killed by enemy or suicide by charge, there is enough to make your phone going to explode
I have update the apk and fix some issue, please try it again, if face the same issue again you can PM me
*edit: i'm testing it on Samsung A51 Android 10 and works fine