diff --git a/docs/local-server.md b/docs/local-server.md
index 3a54c98..4cbd851 100644
--- a/docs/local-server.md
+++ b/docs/local-server.md
@@ -156,7 +156,7 @@ If the monitor is set up on the AirGradient dashboard, it will also receive the
 | `tvocLearningOffset`              | Set VOC learning gain offset.                                    | Number  | 0-720 (default 12)                                                                                                                      | `{"tvocLearningOffset": 12}`                    |
 | `offlineMode`                     | Set monitor to run without WiFi.                                 | Boolean |  `false`: Disabled (default) <br> `true`: Enabled                                                                                       | `{"offlineMode": true}`                         |
 | `monitorDisplayCompensatedValues` | Set the display show the PM value with/without compensate  value (only on [3.1.9]()) | Boolean | `false`: Without compensate (default) <br> `true`: with compensate                                                                      | `{"monitorDisplayCompensatedValues": false }`   |
-| `corrections`                     | Sets correction options to display and measurement values on local server response.    | Object |  _see corrections section_             | _see corrections section_                         |
+| `corrections`                     | Sets correction options to display and measurement values on local server response. (version >= [3.1.11]())    | Object |  _see corrections section_             | _see corrections section_                         |
 
 
 
@@ -206,7 +206,7 @@ curl --location -X PUT 'http://airgradient_84fce612eff4.local/config' --header '
 - PMS5003_20231218 
 
 ```bash
-curl --location -X PUT 'http://airgradient_84fce612eff4.local/config' --header 'Content-Type: application/json' --data '{"corrections":{"pm02":{"correctionAlgorithm":"slr_PMS5003_20231218","slr":{"intercept":0,"scalingFactor":0,03525,"useEpa2021":true}}}}'
+curl --location -X PUT 'http://airgradient_84fce612eff4.local/config' --header 'Content-Type: application/json' --data '{"corrections":{"pm02":{"correctionAlgorithm":"slr_PMS5003_20231218","slr":{"intercept":0,"scalingFactor":0.03525,"useEpa2021":true}}}}'
 ```
 
 - PMS5003_20240104 
diff --git a/src/AgConfigure.cpp b/src/AgConfigure.cpp
index f090d3d..57e864b 100644
--- a/src/AgConfigure.cpp
+++ b/src/AgConfigure.cpp
@@ -354,16 +354,16 @@ bool Configuration::begin(void) {
  * @return false Failure
  */
 bool Configuration::parse(String data, bool isLocal) {
-  logInfo("Parse configure: " + data);
+  logInfo("Parsing configuration: " + data);
 
   JSONVar root = JSON.parse(data);
   failedMessage = "";
-  if (root == undefined) {
+  if (root == undefined || JSONVar::typeof_(root) != "object") {
+    logError("Parse configuration failed, JSON invalid (" + JSONVar::typeof_(root) + ")");
     failedMessage = "JSON invalid";
-    logError(failedMessage);
     return false;
   }
-  logInfo("Parse configure success");
+  logInfo("Parse configuration success");
 
   /** Is configuration changed */
   bool changed = false;
diff --git a/src/AgStateMachine.cpp b/src/AgStateMachine.cpp
index 63d8d63..3656bde 100644
--- a/src/AgStateMachine.cpp
+++ b/src/AgStateMachine.cpp
@@ -87,37 +87,37 @@ bool StateMachine::sensorhandleLeds(void) {
 int StateMachine::co2handleLeds(void) {
   int totalUsed = ag->ledBar.getNumberOfLeds();
   int co2Value = round(value.getAverage(Measurements::CO2));
-  if (co2Value <= 700) {
+  if (co2Value <= 600) {
     /** G; 1 */
     ag->ledBar.setColor(RGB_COLOR_G, ag->ledBar.getNumberOfLeds() - 1);
     totalUsed = 1;
-  } else if (co2Value <= 1000) {
+  } else if (co2Value <= 800) {
     /** GG; 2 */
     ag->ledBar.setColor(RGB_COLOR_G, ag->ledBar.getNumberOfLeds() - 1);
     ag->ledBar.setColor(RGB_COLOR_G, ag->ledBar.getNumberOfLeds() - 2);
     totalUsed = 2;
-  } else if (co2Value <= 1333) {
+  } else if (co2Value <= 1000) {
     /** YYY; 3 */
     ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 1);
     ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 2);
     ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 3);
     totalUsed = 3;
-  } else if (co2Value <= 1666) {
+  } else if (co2Value <= 1250) {
     /** OOOO; 4 */
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 1);
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 2);
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 3);
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 4);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 1);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 2);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 3);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 4);
     totalUsed = 4;
-  } else if (co2Value <= 2000) {
+  } else if (co2Value <= 1500) {
     /** OOOOO; 5 */
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 1);
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 2);
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 3);
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 4);
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 5);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 1);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 2);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 3);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 4);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 5);
     totalUsed = 5;
-  } else if (co2Value <= 2666) {
+  } else if (co2Value <= 1750) {
     /** RRRRRR; 6 */
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 1);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 2);
@@ -126,7 +126,7 @@ int StateMachine::co2handleLeds(void) {
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 5);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 6);
     totalUsed = 6;
-  } else if (co2Value <= 3333) {
+  } else if (co2Value <= 2000) {
     /** RRRRRRR; 7 */
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 1);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 2);
@@ -136,18 +136,18 @@ int StateMachine::co2handleLeds(void) {
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 6);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 7);
     totalUsed = 7;
-  } else if (co2Value <= 4000) {
-    /** RRRRRRRR; 8 */
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 1);
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 2);
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 3);
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 4);
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 5);
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 6);
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 7);
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 8);
+  } else if (co2Value <= 3000) {
+    /** PPPPPPPP; 8 */
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 1);
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 2);
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 3);
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 4);
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 5);
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 6);
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 7);
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 8);
     totalUsed = 8;
-  } else { /** > 4000 */
+  } else { /** > 3000 */
     /* PRPRPRPRP; 9 */
     ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 1);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 2);
diff --git a/src/AgValue.cpp b/src/AgValue.cpp
index b0b281d..0df5db8 100644
--- a/src/AgValue.cpp
+++ b/src/AgValue.cpp
@@ -562,7 +562,7 @@ float Measurements::getCorrectedPM25(AirGradient &ag, Configuration &config, boo
                                     pmCorrection.intercept);
     if (pmCorrection.useEPA) {
       // Add EPA compensation on top of SLR
-      corrected = ag.pms5003.compensate(pm25, humidity);
+      corrected = ag.pms5003.compensate(corrected, humidity);
     }
   }
   }
@@ -896,10 +896,10 @@ JSONVar Measurements::buildPMS(AirGradient &ag, int ch, bool allCh, bool withTem
     pms[json_prop_pm03Count] = ag.round2(avg);
     pms["channels"]["1"][json_prop_pm03Count] = ag.round2(_pm_03_pc[0].update.avg);
     pms["channels"]["2"][json_prop_pm03Count] = ag.round2(_pm_03_pc[1].update.avg);
-  } else if (utils::isValidPm(_pm_03_pc[0].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_03_pc[0].update.avg)) {
     pms[json_prop_pm03Count] = ag.round2(_pm_03_pc[0].update.avg);
     pms["channels"]["1"][json_prop_pm03Count] = ag.round2(_pm_03_pc[0].update.avg);
-  } else if (utils::isValidPm(_pm_03_pc[1].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_03_pc[1].update.avg)) {
     pms[json_prop_pm03Count] = ag.round2(_pm_03_pc[1].update.avg);
     pms["channels"]["2"][json_prop_pm03Count] = ag.round2(_pm_03_pc[1].update.avg);
   }
@@ -911,10 +911,10 @@ JSONVar Measurements::buildPMS(AirGradient &ag, int ch, bool allCh, bool withTem
     pms[json_prop_pm05Count] = ag.round2(avg);
     pms["channels"]["1"][json_prop_pm05Count] = ag.round2(_pm_05_pc[0].update.avg);
     pms["channels"]["2"][json_prop_pm05Count] = ag.round2(_pm_05_pc[1].update.avg);
-  } else if (utils::isValidPm(_pm_05_pc[0].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_05_pc[0].update.avg)) {
     pms[json_prop_pm05Count] = ag.round2(_pm_05_pc[0].update.avg);
     pms["channels"]["1"][json_prop_pm05Count] = ag.round2(_pm_05_pc[0].update.avg);
-  } else if (utils::isValidPm(_pm_05_pc[1].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_05_pc[1].update.avg)) {
     pms[json_prop_pm05Count] = ag.round2(_pm_05_pc[1].update.avg);
     pms["channels"]["2"][json_prop_pm05Count] = ag.round2(_pm_05_pc[1].update.avg);
   }
@@ -925,10 +925,10 @@ JSONVar Measurements::buildPMS(AirGradient &ag, int ch, bool allCh, bool withTem
     pms[json_prop_pm1Count] = ag.round2(avg);
     pms["channels"]["1"][json_prop_pm1Count] = ag.round2(_pm_01_pc[0].update.avg);
     pms["channels"]["2"][json_prop_pm1Count] = ag.round2(_pm_01_pc[1].update.avg);
-  } else if (utils::isValidPm(_pm_01_pc[0].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_01_pc[0].update.avg)) {
     pms[json_prop_pm1Count] = ag.round2(_pm_01_pc[0].update.avg);
     pms["channels"]["1"][json_prop_pm1Count] = ag.round2(_pm_01_pc[0].update.avg);
-  } else if (utils::isValidPm(_pm_01_pc[1].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_01_pc[1].update.avg)) {
     pms[json_prop_pm1Count] = ag.round2(_pm_01_pc[1].update.avg);
     pms["channels"]["2"][json_prop_pm1Count] = ag.round2(_pm_01_pc[1].update.avg);
   }
@@ -940,10 +940,10 @@ JSONVar Measurements::buildPMS(AirGradient &ag, int ch, bool allCh, bool withTem
     pms[json_prop_pm25Count] = ag.round2(avg);
     pms["channels"]["1"][json_prop_pm25Count] = ag.round2(_pm_25_pc[0].update.avg);
     pms["channels"]["2"][json_prop_pm25Count] = ag.round2(_pm_25_pc[1].update.avg);
-  } else if (utils::isValidPm(_pm_25_pc[0].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_25_pc[0].update.avg)) {
     pms[json_prop_pm25Count] = ag.round2(_pm_25_pc[0].update.avg);
     pms["channels"]["1"][json_prop_pm25Count] = ag.round2(_pm_25_pc[0].update.avg);
-  } else if (utils::isValidPm(_pm_25_pc[1].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_25_pc[1].update.avg)) {
     pms[json_prop_pm25Count] = ag.round2(_pm_25_pc[1].update.avg);
     pms["channels"]["2"][json_prop_pm25Count] = ag.round2(_pm_25_pc[1].update.avg);
   }