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Well at least I got the update quickly 🙂
PHN is Netherlands
BTU is United Kingdom direct from Samsung
XEU is United Kingdom/Ireland from Carphone Warehouse
BTU firmware are on phones that come directly from Samsung (unbranded)XEU firmware are on Sim Free handsets that are generic (unbranded) but not from Samsung.
It's basically identical firmwares and will probably be released exactly the same time