Samsung Note 3 latest firmware

Hello
I need to know what is the latest firmware for USA Samsung Note 3 (SMN900) and where to download it from.
What is the country code for USA for samsung phones? Couldnt find it either on sammobile or samsung-updates websites.
I am using SamFirm and need to know the PDA, CSC and Phone values to input in the app, to look for the latest firmware.
Whatever I put, it gives the error

Code:

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Could not send BinaryInform. Status code 200/400

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This is what I am inputting in the SamFirm app on my laptop:
SMN900A/XAR/N900AUCUCNC2/N900AATTCNC2/N900AUCUCNC2

Please send me correct values for these

Thanks

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