I just want to say that I have successful made it work for the game "The Room Pocket" on my non-jailbreak iPhone 6s Plus running iOS 12.4.
Thank you for the tutorial, and special thank to the developer of iMazing program.
To make this clear, I got a promp screen about setting up my iPhone for first use after rebooting. But don't worry, just follow the steps, and everything will be back to normal, nothing changes except that your game has been hacked
One more thing, the program asked me for my Apple ID and password when I went to the "Manage App" section, don't worry and just logging in. I'm pretty sure that it's safe because my Apple ID has 2-factor auth, after typing id and password I got a verification call from Apple.