So i have a Samsung Galaxy A05, my bro also has one, all same there's no difference, but my brother updated his Android version to 15 and UI7, but mine is refusing to update it seems its jot available.what could be the problem?

Hi guys, how strange is this, a month ago i could gave swore i had a Software Update option on my my Samsung Galaxy A05 settings, but now i can't find it, i don't even know how i can update my software now, help!

So this option *#0# is not working on my A05, donno if that normal or not, but anyways how fo i check if my phone is original, like what's the game changer test