diff --git a/mission/acs/str/StarTrackerHandler.cpp b/mission/acs/str/StarTrackerHandler.cpp
index def0bea8..520979a8 100644
--- a/mission/acs/str/StarTrackerHandler.cpp
+++ b/mission/acs/str/StarTrackerHandler.cpp
@@ -213,6 +213,8 @@ ReturnValue_t StarTrackerHandler::executeAction(ActionId_t actionId, MessageQueu
     default:
       break;
   }
+  // In case the JSON has changed, reinitiate the next parameter set to update.
+  reinitNextSetParam = true;
   return DeviceHandlerBase::executeAction(actionId, commandedBy, data, size);
 }
 
@@ -273,6 +275,7 @@ void StarTrackerHandler::doShutDown() {
   startupState = StartupState::IDLE;
   bootState = FwBootState::NONE;
   solutionSet.setReportingEnabled(false);
+  reinitNextSetParam = false;
   setMode(_MODE_POWER_DOWN);
 }
 
@@ -313,6 +316,8 @@ ReturnValue_t StarTrackerHandler::buildTransitionDeviceCommand(DeviceCommandId_t
         if (bootCountdown.isBusy()) {
           return NOTHING_TO_SEND;
         }
+        // Was already done.
+        reinitNextSetParam = false;
         bootState = FwBootState::REQ_VERSION;
       }
       switch (bootState) {
@@ -461,7 +466,8 @@ ReturnValue_t StarTrackerHandler::buildCommandFromCommand(DeviceCommandId_t devi
       return returnvalue::OK;
     }
     case (startracker::SUBSCRIPTION): {
-      result = prepareParamCommand(commandData, commandDataLen, jcfgs.subscription);
+      result = prepareParamCommand(commandData, commandDataLen, jcfgs.subscription,
+          reinitNextSetParam);
       return returnvalue::OK;
     }
     case (startracker::REQ_SOLUTION): {
@@ -477,55 +483,55 @@ ReturnValue_t StarTrackerHandler::buildCommandFromCommand(DeviceCommandId_t devi
       return returnvalue::OK;
     }
     case (startracker::LIMITS): {
-      result = prepareParamCommand(commandData, commandDataLen, jcfgs.limits);
+      result = prepareParamCommand(commandData, commandDataLen, jcfgs.limits, reinitNextSetParam);
       return result;
     }
     case (startracker::MOUNTING): {
-      result = prepareParamCommand(commandData, commandDataLen, jcfgs.mounting);
+      result = prepareParamCommand(commandData, commandDataLen, jcfgs.mounting, reinitNextSetParam);
       return result;
     }
     case (startracker::IMAGE_PROCESSOR): {
-      result = prepareParamCommand(commandData, commandDataLen, jcfgs.imageProcessor);
+      result = prepareParamCommand(commandData, commandDataLen, jcfgs.imageProcessor, reinitNextSetParam);
       return result;
     }
     case (startracker::CAMERA): {
-      result = prepareParamCommand(commandData, commandDataLen, jcfgs.camera);
+      result = prepareParamCommand(commandData, commandDataLen, jcfgs.camera, reinitNextSetParam);
       return result;
     }
     case (startracker::CENTROIDING): {
-      result = prepareParamCommand(commandData, commandDataLen, jcfgs.centroiding);
+      result = prepareParamCommand(commandData, commandDataLen, jcfgs.centroiding, reinitNextSetParam);
       return result;
     }
     case (startracker::LISA): {
-      result = prepareParamCommand(commandData, commandDataLen, jcfgs.lisa);
+      result = prepareParamCommand(commandData, commandDataLen, jcfgs.lisa, reinitNextSetParam);
       return result;
     }
     case (startracker::MATCHING): {
-      result = prepareParamCommand(commandData, commandDataLen, jcfgs.matching);
+      result = prepareParamCommand(commandData, commandDataLen, jcfgs.matching, reinitNextSetParam);
       return result;
     }
     case (startracker::VALIDATION): {
-      result = prepareParamCommand(commandData, commandDataLen, jcfgs.validation);
+      result = prepareParamCommand(commandData, commandDataLen, jcfgs.validation, reinitNextSetParam);
       return result;
     }
     case (startracker::ALGO): {
-      result = prepareParamCommand(commandData, commandDataLen, jcfgs.algo);
+      result = prepareParamCommand(commandData, commandDataLen, jcfgs.algo, reinitNextSetParam);
       return result;
     }
     case (startracker::TRACKING): {
-      result = prepareParamCommand(commandData, commandDataLen, jcfgs.tracking);
+      result = prepareParamCommand(commandData, commandDataLen, jcfgs.tracking, reinitNextSetParam);
       return result;
     }
     case (startracker::LOGLEVEL): {
-      result = prepareParamCommand(commandData, commandDataLen, jcfgs.logLevel);
+      result = prepareParamCommand(commandData, commandDataLen, jcfgs.logLevel, reinitNextSetParam);
       return result;
     }
     case (startracker::LOGSUBSCRIPTION): {
-      result = prepareParamCommand(commandData, commandDataLen, jcfgs.logSubscription);
+      result = prepareParamCommand(commandData, commandDataLen, jcfgs.logSubscription, reinitNextSetParam);
       return result;
     }
     case (startracker::DEBUG_CAMERA): {
-      result = prepareParamCommand(commandData, commandDataLen, jcfgs.debugCamera);
+      result = prepareParamCommand(commandData, commandDataLen, jcfgs.debugCamera, reinitNextSetParam);
       return result;
     }
     case (startracker::CHECKSUM): {
@@ -1690,12 +1696,19 @@ void StarTrackerHandler::prepareHistogramRequest() {
 
 ReturnValue_t StarTrackerHandler::prepareParamCommand(const uint8_t* commandData,
                                                       size_t commandDataLen,
-                                                      ArcsecJsonParamBase& paramSet) {
+                                                      ArcsecJsonParamBase& paramSet,
+                                                      bool reinitSet) {
   // Stopwatch watch;
   ReturnValue_t result = returnvalue::OK;
   if (commandDataLen > MAX_PATH_SIZE) {
     return FILE_PATH_TOO_LONG;
   }
+  if(reinitSet) {
+    result = paramSet.init(paramJsonFile);
+    if(result != returnvalue::OK) {
+      return result;
+    }
+  }
 
   result = paramSet.create(commandBuffer);
   if (result != returnvalue::OK) {
diff --git a/mission/acs/str/StarTrackerHandler.h b/mission/acs/str/StarTrackerHandler.h
index c1acc545..69b3e121 100644
--- a/mission/acs/str/StarTrackerHandler.h
+++ b/mission/acs/str/StarTrackerHandler.h
@@ -287,6 +287,8 @@ class StarTrackerHandler : public DeviceHandlerBase {
 
   InternalState internalState = InternalState::IDLE;
 
+  bool reinitNextSetParam = false;
+
   bool strHelperHandlingSpecialRequest = false;
 
   const power::Switch_t powerSwitch = power::NO_SWITCH;
@@ -409,7 +411,7 @@ class StarTrackerHandler : public DeviceHandlerBase {
    * @return  returnvalue::OK if successful, otherwise error return Value
    */
   ReturnValue_t prepareParamCommand(const uint8_t* commandData, size_t commandDataLen,
-                                    ArcsecJsonParamBase& paramSet);
+                                    ArcsecJsonParamBase& paramSet, bool reinitSet);
 
   /**
    * @brief   The following function will fill the command buffer with the command to request