Samsung Galaxy S4 Active — Got this message on my phone...WARNING Your phone does not have CSC version

Got this Samsung Note 4 from E Bay sold as new, a grey import i think was made for the US market not the UK, the original CSC code isATT, it says Firmwares CSC code is TGY and under active CSC Code ATT/TGY and under CSC Country USA.

I used the app Samsung Phone info and done a refurbished check and this message comes up

It looks like the firmware has been modified

WARNING Your phone does not have CSC version

Device usage counter
Headset connect-
Charger connect =3830
S Pen detach=

Can anyone tell me what all that means, will i still be able to use phone in the UK and get updates, the phone was sold as new but no guarantee came with it, was from E Bay so ican return it was 235 Pounds a new one in the UK is about 400 Pounds, thank you.