function hack() {  
  let frame = document.querySelector("iframe");
  if (frame) {
    let src = frame.getAttribute("src");
    src = src.replace("tgWebAppPlatform=weba", "tgWebAppPlatform=android");
    src = src.replace("tgWebAppPlatform=web", "tgWebAppPlatform=android");
    frame.setAttribute("src", src);
    alert("hacked");
  } else {
    alert("no iframe");
  }
}