i think it will be work:
1. download linage os from
https://konstakang.com/devices/rpi4/LineageOS16.0/
2. download gapps package from
http://opengapps.org/. (select “arm” , “9” , “pico” and push red button. not tvstock)
3. unzip linage os(do NOT extract gapps package) and write it to sdcard
4. plug sdcard to raspberrypi and boot and setup
5. open Settings -> About tablet and Click ‘Build number’ 7 times to enable developer options
6. open “Settings” –> “Developer Options” and Enable “Local Terminal”.
7. “Settings” –> “Developer Options” and set Root Acess to apps and ADB.
8. open terminal
9. type “su” and enter
10. click OK
11. copy gapps package to USB memory and plug it to raspberrypi
11. type “rpi4-recovery.sh” and enter(if it is raspberrypi3, rpi3-recovery.sh)
12. type “reboot” and enter
13. select “install”
14. click “Select Storage” and select USB-OTG
15. swipe to install gapps
16. wait until install will complete
17. click “Wipe Dalvik” and swipe
18. click “Reboot System”
19. select “Mount”
20. select “Boot” and “System”. then click logo mark
21. select “Advanced”
22. select “Terminal”
22. type “rpi4-recovery.sh boot” and enter(if it is raspberrypi3, rpi3-recovery.sh)
23. type “reboot” and enter
24. unlock and click top
25. click blue
26. click “start”,and wait
27. click “do not copy”,and wait
28. login google account and click “i accept.” and wait(do NOT close app)
30. install your firefox from play store and start it
31. install “TVHome Launcher” and “Set Orientation” from play store
32. download apk from
https://aptoide-tv.en.aptoide.com/app and install it
32. press F5 for 3 sec. and select “reboot”,”system”
done!!