Solved! Go to Solution.
Anyway, yes, I can confirm it's Swiss:
|Model name||Galaxy S6|
|Build date||Thu, 15 Oct 2015 04:41:20 +0000|
If you want to flash UK you need to download this firmware to your PC http://www.sammobile.com/firmwares/download/66426/G920FXXU3DPBG_G920FBTU3DPB1_BTU/
and use Odin to flash it to your phone.
This is quite confusing as the S6 family of devices have had Marshmallow available to them for at least a couple of weeks now > http://community.o2.co.uk/t5/Welcome-News/Android-6-0-Marshmallow-HUB/td-p/923104
On 31st March we even approved a maintenance release of 6.0.1 for the S6 family, after the initial Marshmallow update > http://community.o2.co.uk/t5/Welcome-News/Android-6-0-Marshmallow-HUB/m-p/960496#M15538
Where did you get your phone from, and have you tried checking manually for updates from the phone and/or via Samsung KIES?
@Anonymous can you dial *#1234# and tell me your CSC please?
Where did you get phone from?