Ok, I am not good at this... I have to research it on the internet everytime I have reload anything on my phone.
You will need to follow your manual or internet instrucitons on how to check/update your phone operating system.
For the Samsung watch app and FACER, I think you do this by finding them in the Galaxy store and clicking on update.
Once you have done that, there should be an option in the Samsung watch app to update your watch apps including FACER.
Sorry I can't be more help than that - it is way outside my area of knowledge.