Purchased a S5, can you please identify the Model number?

I am very confused, Item is a refurb, has been rooted and therefore i want to put a clean stock rom on it, however i am getting mixed signals. phone is labelled g900f on the sticker and about phone, however i think this is fake, so the seller could sell it as a British model, I went in to recovery, the boot-loader stated it was a g900t. Also in the settings / about / there is a section referring to The united Emirates, which i have not ever seen before. I do believe it is a real s5 though as it has a snapdragon processor. Also the Imei number and serial number match the sticker, however i have a feeling this was somehow done by the seller, or who ever is supplying the seller who sold it to me. Other than that phone is working fine, but does not receive OTA updates. Also for some reason in the Ringtone section there are some built in AT&T ones.

can someone try to make sense of this, and tell me which exact Official ROM i would need to use.

Thanks.

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