Is it okay if I install an update (in this case, the Android 12) that's meant for other country to install on my Singapore Galaxy A51? Or do I have to wait for the update to officially reach my phone?
I suggest it's best that you wait for Over-the-Air (OTA) update. It's safer that way. Unless u are very confident that the update won't cause any issues. Cos usually, updates are catered to respective countries.