diff --git a/eive_tmtc/tmtc/acs/star_tracker.py b/eive_tmtc/tmtc/acs/star_tracker.py
index 1923613..4c0b02a 100644
--- a/eive_tmtc/tmtc/acs/star_tracker.py
+++ b/eive_tmtc/tmtc/acs/star_tracker.py
@@ -33,6 +33,15 @@ from eive_tmtc.config.object_ids import STR_ASSEMBLY, STAR_TRACKER_ID
 _LOGGER = logging.getLogger(__name__)
 
 
+class FirmwareTarget(enum.IntEnum):
+    MAIN = 1
+    BACKUP = 10
+
+
+class ParamId(enum.IntEnum):
+    FIRMWARE_TARGET = 1
+
+
 class StarTrackerActionId(enum.IntEnum):
     PING = 0
     BOOT = 1
@@ -126,6 +135,8 @@ class OpCode:
     SET_TIME_FROM_SYS_TIME = "set_time"
     RELOAD_JSON_CFG_FILE = "reload_json_cfg"
     FW_UPDATE_BACKUP = "fw_update_backup"
+    SELECT_TARGET_FIRMWARE_MAIN = "select_fw_target_main"
+    SELECT_TARGET_FIRMWARE_BACKUP = "select_fw_target_backup"
 
 
 class Info:
@@ -143,6 +154,8 @@ class Info:
     FW_UPDATE_BACKUP = "Update Backup Firmware Slot"
     SET_TIME_FROM_SYS_TIME = "Set time from system time"
     RELOAD_JSON_CFG_FILE = "Reload JSON configuration file. Reboot still required."
+    SELECT_TARGET_FIRMWARE_MAIN = "Select main slot firmware"
+    SELECT_TARGET_FIRMWARE_BACKUP = "Select backup slot firmware"
 
 
 class SetId(enum.IntEnum):