I'm running 5.2 and I changed my product code from KOR to XEU. Phone did a factory reset though but it changed. And for the WIFI, first time ever my second hotspot in my WDS chain is working properly. (before this, i could connect to it after a full factory reset but after phone boot, it didn't work anymore, but now it does and i'm sooo happy). Market is working just fine and Samsung apps had 18 apps in it With stock rom i had 8 apps there.
Me too, me too Factory reset after I insalled all apps and set contacts etc etc