Help can't figure out my galaxy s5's model number

[txdxxl]

I wanted to flash a marshmallow update on my galaxy s5 but i'm confused as to which firmware to download since i'm not sure what my phone model is. when i go to 'about device' under 'model number' it is written 'SM-G900F', but when i boot into download model, it is written that my phone model is 'SM-G906S'. Help me figure which one of the two is the actual model number please

 

[Slug]

You have an SM-G906S, which is the Korean-only LTE-A version.

 

[txdxxl]

You have an SM-G906S, which is the Korean-only LTE-A version.

then why does it say G900F in about device?

 

[Slug]

then why does it say G900F in about device?

I don't know. Maybe take that up with whoever sold it to you? The Korean LTE-A version is definitely the G906S, though.

 

[Jfalls63]

There is a free app at the Play Store called Sammobile Device info. Along with model number, it will display current Firmware Version, Product and CSC codes.
If you could post screen shots of the information, Except IMEI number, we may be able to tell a little more about what you actually have.