diff --git a/protos/cmvr/config/arm_config/arm_config.proto b/protos/cmvr/config/arm_config/arm_config.proto
index eb70bbc9..f1749569 100644
--- a/protos/cmvr/config/arm_config/arm_config.proto
+++ b/protos/cmvr/config/arm_config/arm_config.proto
@@ -47,6 +47,10 @@ message VendorRobotArmBackendConfig {
   optional bool auto_power_on_after_hardware_estop_release = 11;
 }
 
+// Schema placeholder retained for DeviceManager compatibility. The UME
+// hardware backend is intentionally not enabled in the Linbo deployment.
+message UmeRobotArmBackendConfig {}
+
 message SpeedLPlannerConfig {
   double linear_velocity_max = 1;
   double linear_acceleration_max = 2;
@@ -135,6 +139,7 @@ message RobotArmConfig {
   oneof backend {
     MotorRobotArmBackendConfig motor = 10;
     VendorRobotArmBackendConfig vendor = 11;
+    UmeRobotArmBackendConfig ume = 12;
   }
 
   ArmKinematicsConfig kinematics = 20;