Hi @Gryffindor56123 The A12 was scheduled to receive One UI 4.0/4.1 in July earlier https://www.androidcentral.com/when-will-my-phone-get-android-12 However appears to have pushed back to this month according to Android Update Tracker https://www.androidupdatetracker.com/p/samsung-galaxy-a12
obviously could try Smart Switch.
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 4.0,Android 12 Official Version.