Fimi x8 se app problem

Hello. New to this sight. I have a 2018 Fimi x8 se in perfect flying condition. I haven’t flown for some time and have lost the original app on my phone. The original has the orange fimi app icon. Could not find the original app to reinstall so I tried the 2020 app. I can’t get it to work with that app. I did a search and some claim it works. Is there anyone that can give me some solid help? Fimi support is worthless, can’t get any replies.