Flashed BTU from sammobile but is still EVR I'm trying to flash BTU stock firmware from sammobile for my s9 g960f. I got the firmware from here https://www.sammobile.com/firmwares/galaxy-s9/SM-G960F/BTU/  date: 14/11/18 pda: G960FXXS2BRJ6.

I used Odin to install the firmware, it appared to work from odin and the phone restated and went straight to android setup, but is started to install EE apps and is showing as EVR crc in software info. Could this an error on my end or not the right files on sammobile?
Not sure if it is an error on your end or Sammobiles. You did however appear to have flashed EVR firmware variant instead of Blu firmware variant.

Carefully check and re-download the Blu firmware variant and flash again through Odin.
Thinking about it though, as long as the CSC you are changing it from is not included in the CSC you are flashing, otherwise it will just default back to the phones original CSC.
You will need to flash CSC and not HOME_CSC in order to change though, which will reset the phone back to factory.
If the problem persists, contact Sammobile customer support to inform them of issue.