@byMaX You too, your link has got nothing to do with his question, did you even read his post? :p

LAM_1 US English - Brazilian Portuguese - Latin American Spanish
That's from the languages description. Haven't heard of NAM_1...but R1GB001 isn't the only firmware with that region code. I first thought it was a spelling mistake but there are many FW's for Z710 with nam region code. Strange...