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in the 'about phone option' it says that is is the same as the A520F.. i am from australiaIt may depend on country and carrier. I've checked on Sammobile.com and for the global single-SIM A5 (A520F) it's available for most but not all - the are sometimes variations of a few months in when some countries/carriers get updates. I'd not found the dual sim model there so can't confirm status of that.
SM-A520F/DSIf it is dual sim I wouldn't take it for granted that it's the same, but if you have the full model number and product code it should be possible to find out.
S8 is irrelevant here: firmware is specific to the phone model, and different models from the same manufacturer get it at different times.
If this phone was originally bought through one service provider but is being used with another that can sometimes affect whether you get the update notification as well.