diff --git a/build/api/core/Checker.php b/build/api/core/Checker.php
index 0aa6056..65e9262 100644
--- a/build/api/core/Checker.php
+++ b/build/api/core/Checker.php
@@ -99,6 +99,10 @@
 					return $checker && is_string($value) && preg_match('/^[\w\.-]+$/ui', $value);
 					break;
 
+				case 'lettersutf8':
+					return $checker && is_string($value) && preg_match('/^[^\W\d]+$/ui', $value);
+					break;
+
 				case 'letters':
 					return $checker && is_string($value) && preg_match('/^[a-z -]+$/i', $value);
 					break;
@@ -107,6 +111,10 @@
 					return $checker && is_numeric($value) && floor($value) == $value && $value >= 0 && $value <= 100;
 					break;
 
+				case 'rfid':
+					return $checker && preg_match('@^[\dA-F]{2}(?:\-[\dA-F]{2}){3,5}$@', $value);
+					break;
+
 				// Tableau non vide
 				case 'array':
 					return $checker && is_array($value) && count($value) > 0;
diff --git a/build/orm/core/Rows.php b/build/orm/core/Rows.php
index 75de9df..ec66941 100755
--- a/build/orm/core/Rows.php
+++ b/build/orm/core/Rows.php
@@ -1082,9 +1082,9 @@
 							$formatted[$i][$index] = floatval( $value );
 						// String utf8 management
 						elseif( \mb_detect_encoding($value) === 'UTF-8' )
-							$formatted[$i][$index] = utf8_encode($value);
+							$formatted[$i][$index] = $value;
 						else
-							$formatted[$i][$index] = utf8_encode(utf8_decode($value));
+							$formatted[$i][$index] = utf8_encode($value);
 
 					// Si pas non plus une aggrégation et si indice numérique, on le retire
 					}else if( !preg_match('/^agg_.+/', $index) && is_numeric($index) )
diff --git a/config/modules.json b/config/modules.json
index d07240a..e72845b 100755
--- a/config/modules.json
+++ b/config/modules.json
@@ -92,8 +92,8 @@
 			"parameters": {
 				"code":      { "description": "Code RFID de l'utilisateur.",    "type": "rfid"                       },
 				"username":  { "description": "Identifiant de l'utilisateur.",  "type": "varchar(1,30,alphanumeric)" },
-				"firstname": { "description": "Prénom de l'utilisateur.",       "type": "varchar(3,30,letters)"      },
-				"lastname":  { "description": "Nom de l'utilisateur.",          "type": "varchar(3,30,letters)"      },
+				"firstname": { "description": "Prénom de l'utilisateur.",       "type": "varchar(3,30,lettersutf8)"      },
+				"lastname":  { "description": "Nom de l'utilisateur.",          "type": "varchar(3,30,lettersutf8)"      },
 				"mail":      { "description": "Adresse mail de l'utilisateur.", "type": "mail"                       }
 			},
 			"output": {
@@ -193,8 +193,8 @@
 				"id_user":   { "description": "UID de l'utilisateur.",          "type": "id"                                           },
 				"code":      { "description": "Code RFID de l'utilisateur.",    "type": "rfid",                       "optional": true },
 				"username":  { "description": "Identifiant de l'utilisateur.",  "type": "varchar(1,30,alphanumeric)", "optional": true },
-				"firstname": { "description": "Prénom de l'utilisateur.",       "type": "varchar(3,30,letters)",      "optional": true },
-				"lastname":  { "description": "Nom de l'utilisateur.",          "type": "varchar(3,30,letters)",      "optional": true },
+				"firstname": { "description": "Prénom de l'utilisateur.",       "type": "varchar(3,30,lettersutf8)",      "optional": true },
+				"lastname":  { "description": "Nom de l'utilisateur.",          "type": "varchar(3,30,lettersutf8)",      "optional": true },
 				"mail":      { "description": "Adresse mail de l'utilisateur.", "type": "mail",                       "optional": true },
 				"password":  { "description": "Mot de passe de l'utilisateur.", "type": "text",                       "optional": true },
 				"status":    { "description": "Status de l'utilisateur.",       "type": "status",                     "optional": true }