Unlock your Galaxy A05 and open the Settings app (gear icon).
Open Smart Switch on your PC.
On your PC, download and install Samsung Smart Switch from the official Samsung website. How to Update Software on SAMSUNG Galaxy A05
Your phone will check for available updates. If none are found, it will show “Your software is up to date.” Unlock your Galaxy A05 and open the Settings app (gear icon)
If an update is available, tap Download . Wait for the download to complete. How to Update Software on SAMSUNG Galaxy A05