Cannot reinstall preinstalled apps

Hello
I have a serious problem with my installation of IodeOs 6.4 on FP5 : I had toubles with Aurora (I saw another post about it). Since I also had troubles with the call app, and message app, I decided to uninstall and reinstall them with preinstalled apps (just rebooting). But they can be uninstalled, but not reinstall…

Then I saw a new beta version is coming, so I decided to unistall updater to install beta updater from github page. I hopped it could help : I could uninstall but not install anything…

It is maybe a matter of developper option : following some tutos and post about installing whatsapp on a custom rom, I changed some developper option, but I think I had reset them as they were

Would you please give me some help, since the main apps of my phone are no longer available…

Thanks !!

Thomas

Hello
I would like to specify that I cannot install fdroid from the apk downloafed from web. Nor any apk probably
Thank you in advance for your help,
Thomas

I eventually used adb to make a backup and reseted
But the backup failed…
I am going to study the best way to make a backup

Backup of what?
System?
With iode, you can only use seedvault

I tried to make a backup with adb
with this command : adb backup -apk -shared -all -f backup.ab

but it did not work as expected

I only realized it after the reset to factory

I would like to point out that even after the reset (and update to 5.6) I have troubles with preinstalled apps :

  • those that I did not install appear anyway in the apps list, and Magic Earth was installed by an update of offered by Aurora

  • I can not install the camera after the first boot, even with reboot

  • the message app does not recognize the other camera app (fossify camera)

Thanks again for your answers

Actually the problem is not that I cannot reinstall preinstalled apps (the camera in this case) but that other camera apps are not recognized by the message app, nor by any app that need to access a camera
Thanks again