Flash code is if you want to "flush" the software and upgrade or put a new one... E.g remove safcoms and put zain's.
Though I will say this is not neccesary unless you have to..
Whatever software you are using; be it Zain or Safcom - simply create a "New Profile" and put the right "APN" in that profile - such that you will simply be selecting from the pull down menu every time you change the simcard.
I hope this sheds some light.
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