Thanks for reaching out to us in order to find out if your beloved Samsung Galaxy A12 will have the latest update, One UI 5.1.
Your Samsung Galaxy A12 was released in December 2020 and Samsung releases monthly, quarterly, and biannual firmware security updates on selected Samsung devices.
And select devices launched in 2019 or later will be supported with firmware security updates for a minimum of four (4) years following their global launch, while select newer devices will receive up to five (5) years of security updates.
Monthly, quarterly and biannual firmware security updates will include patches for Android OS related security issues released by Google, as well as, patches for Samsung-specific security issues.
Rollouts and release times may vary depending on device version and model, service version, country or region, and network.
Thanks for patiently waiting.