I ran into the same issue when flashing a brand new GS290 with /e/OS 0.19. When these “bluetooth keeps stopping” messages appear on screen repeatedly here are the steps (I followed) to get things right:
- Go to the GS290 revert to stock rom page and follow the instructions there to get Android 10 stock rom installed
- Start the phone and update several times until May 2021 update is running
- Do not execute any further updates!
- Use easy-installer to flash /e/OS. Remember not do any further system updates, even if easy-installer tells you so.
- Have fun with your new installation and don’t forget to donate if you are able to.
kind regards
Christian