How do to update Samsung Note 3 firmware?

0091/2

Well-known member
Guys, I need help with this. The phone I have is an Att Samsung note 3 but for some reason the model is identify as galaxy s5(SM-G900W8) in about device. The carrier for this phone is t-mobile. I'm really confuse on how to update this device.
I had the phone downgraded at a phone repair shop years back I don't WTF they did to it to it register as a galaxy s5.:bleh:
 
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