Yes will not work. If i change csc to BTU it will change automatically to EUX but not a full change because i still have the operator coding EVR. All i get after reflashing csc is EUX/-/EUX/EVR and no ota updates. From what i have reed Samsung has changed BTU with EUX for faster updates at least for S22 Ultra. If someone with S22 ultra purchased from Samsung directly can confirm what service provider software version it has?