The A05 was not existing around that year, but no problem. Go to settings > About phone > software information
Over here, you will copy the baseband version and ask for AI apps (chatgpt) to decode that baseband version for you.
Secondly, check the android security patch level. This will tell if your phone is up to date or not. The "2020" date is just part of the internal security component versioning system, not your update status.🙏
