Samsung has released One UI 2.5 update for the Galaxy A31 carries firmware version A315NKSU1BTK2, while the firmware version for Galaxy A51 is M515FXXU1BTK4. Both are based on Android 10 and come with November 2020 Android security patch.
This is currently seeding A31 in South Korea and for Galaxy M51 in Russia and Ukraine. If you haven't received it yet, you can try checking for it manually by heading to the Settings > Software update menu
If it's still not there be patient you'll get it soon 📲📲📲
Galaxy M51 i updated new update version One UI core 2.5 (November security patch received at December 17) in this version there no Secure folder in my phone but i saw all YouTube chennal in india there have secure folder Why i cant get the secure folder in my phone And after i update my phone the bettery is getting low soon