Thanks for your inquiry, here.
Your well-loved Samsung Galaxy A12 was released in December 2020 with Android 10 OS and already received two major upgrades ; Android 11 and Android 12.
Samsung places the utmost importance on providing Galaxy users with the latest mobile experiences possible as long as hardware specifications for upgrades are met and the experience can be optimized. Galaxy devices not eligible to receive four generations of One UI upgrades are still supported with up to three generations of One UI upgrades, an improvement over the two generations previously offered.
For more help and assistance, you may contact us on our online Samsung Customer Care support channels below.