Galaxy A03 Core owners beware: don't update to Android 12!
For A03 Core owners: DO NOT UPDATE TO ANDROID 12!
I was very excited to install the update and found myself with a frozen, slow system with an inconsistent interface. I reset the device and nothing changed.
I had to downgrade the OS (THANKFULLY Samsung did not changed the binary number) and that wasn't very easy. At least now my phone is responsive again.
UPDATE 2023/12/23: months after this post I decided to update to Android 12 again, and the ROM seems to be fine now. An Android 13 OTA launched on Russia some time ago, so expect the next chapter of this saga.