speaker stopped working after notifications sounded tinny

It happened soon after an Android upgrade

They mic works when headphone is plugged in but the external speaker stop working. Nokia said uninstall the upgrades. I did this and cleared some caches and got momentarily tinny sound for a day then then it stopped working completely again.

They said I should restore to factory defaults which I haven't done yet. I'm worried about losing information and and not concentrating enough to do the prep for this to ensure I don't lose any data. It is backed up with Google.