1. It is difficult to rule out what you have for a problem.
2. You write that you use different variants of the stock firmware. Which variant?
3. Try to ask the creator of the APK.
4. Try to consult the developer or the manufacturer.
5. Stop app, clear cache, restart app.
6. Uninstall and reinstall APK.
7. Are there any updates for the box? So that it looks like the other box.
8. Is there an update to your APK?
9. Is it a Fake box?
10. Android Oreo or Nougat
I could give advice all night now, but I did not install this APK. In addition, I use Nonchers V4.6 as a custom rom
Even if I install this APK, it would not do you any good if she runs with me.
First of all, THANK YOU FOR YOUR ATTENTION & REPLY!
1. Download that program, install & open it. Then you will see that
2. I wrote different stocks, but both of them are VORKE stock firmware and Android 7.1.2... one of them is special stock for that apk. I tried many times to copy all stock files of working box and restore it to another box that stock. Device is working normally, all programs opening and working except that IPTV program.
3. I couldn't find creator of the program.
4. Developer or manufacturer gives advice to use origional progDVB program. but it isn't working like that apk. because IPTV.apk is rebuilded by someone, special for IPTV in our country.
5-6. Stopped, reinstalled and cleared cache many times. Result same...
7. There is no updates. same versions
8. Only that version of this apk. no another version or update.
9. Box isn't fake.
10. Android 7.1.2 Nougat.
THANK YOU!