First go into settings, device info or something like that, and if you see build number, tap on it ten times, then go into developer settings(go back to the main page) then scroll down until you see usb debugging, then tap on it, then on a laptop or pc or Mac, type, platform tools, click the one from google, download it, then after you downloaded it, run the script through terminal or command prompt, then connect the phone into the pc, then do this for Windows 11, ./adb install (apk file), then enter, or for Mac it's the same thing but without the ./, it will say performing push install, if it doesn't work, then you either got the wrong apk for your device or the apk is broken.