Flashed BTU from sammobile but is still EVR
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.