diff --git a/CHANGELOG.md b/CHANGELOG.md
index f760ff2..44cebf5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+# v4.8.1
+
+### Bugfix
+
+- [#252](https://github.com/pedro-teixeira/correios/issues/252) Corrige atualizações das versões 4.7.1 e 4.7.2
+
 # v4.8.0
 
 ### Bugfix
diff --git a/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/install-4.8.0.php b/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/install-4.8.0.php
index 2d475e0..39d3831 100644
--- a/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/install-4.8.0.php
+++ b/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/install-4.8.0.php
@@ -138,112 +138,90 @@
 
 }
 
-$installer->run(
-    "CREATE TABLE IF NOT EXISTS {$this->getTable('pedroteixeira_correios/postmethod')} (
-      method_id int(11) unsigned NOT NULL auto_increment,
-      method_code varchar(5) NOT NULL default '0',
-      method_title varchar(255) NOT NULL default '',
-      PRIMARY KEY (method_id)
-    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;"
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
-    array(
-        'method_id'    => '1',
-        'method_code'  => '41106',
-        'method_title' => 'PAC SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+$tableName = $this->getTable('pedroteixeira_correios/postmethod');
+$table = $installer->getConnection()
+    ->newTable($tableName)
+    ->addColumn(
+        'method_id',
+        Varien_Db_Ddl_Table::TYPE_INTEGER,
+        null,
+        array(
+            'identity'  => true,
+            'unsigned'  => true,
+            'nullable'  => false,
+            'primary'   => true,
+        ),
+        'ID'
+    )->addColumn(
+        'method_code',
+        Varien_Db_Ddl_Table::TYPE_TEXT,
+        5,
+        array(
+            'nullable'  => false,
+            'default'   => '0'
+        ),
+        'Code'
+    )->addColumn(
+        'method_title',
+        Varien_Db_Ddl_Table::TYPE_TEXT,
+        255,
+        array(
+            'nullable'  => false,
+            'default'   => ''
+        ),
+        'Title'
+    )->addIndex(
+        $installer->getIdxName(
+            $tableName,
+            array('method_code'),
+            Varien_Db_Adapter_Interface::INDEX_TYPE_UNIQUE
+        ),
+        array('method_code'),
+        array('type' => Varien_Db_Adapter_Interface::INDEX_TYPE_UNIQUE)
+    );
+$installer->getConnection()->createTable($table);
+
+$services = array(
     array(
-        'method_id'    => '2',
-        'method_code'  => '40010',
-        'method_title' => 'SEDEX SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
-    array(
-        'method_id'    => '3',
         'method_code'  => '40045',
         'method_title' => 'SEDEX A COBRAR SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '4',
         'method_code'  => '40215',
         'method_title' => 'SEDEX 10 SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '5',
         'method_code'  => '40290',
         'method_title' => 'SEDEX HOJE SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '6',
         'method_code'  => '04510',
         'method_title' => 'PAC SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '7',
         'method_code'  => '04014',
         'method_title' => 'SEDEX SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '8',
         'method_code'  => '04669',
         'method_title' => 'PAC CONTRATO AGENCIA',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '9',
         'method_code'  => '04162',
         'method_title' => 'SEDEX CONTRATO AGENCIA',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '10',
         'method_code'  => '04693',
         'method_title' => 'PAC CONTRATO GRANDES FORMATOS',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '11',
         'method_code'  => '10065',
         'method_title' => 'CARTA COMERCIAL A FATURAR',
     )
 );
 
+foreach ($services as $service) {
+    $installer->getConnection()->insertOnDuplicate($tableName, $service, array('method_code'));
+}
+
 $installer->endSetup();
diff --git a/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/install-4.8.1.php b/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/install-4.8.1.php
index 9b1794f..39d3831 100644
--- a/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/install-4.8.1.php
+++ b/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/install-4.8.1.php
@@ -138,94 +138,90 @@
 
 }
 
-$installer->run(
-    "CREATE TABLE IF NOT EXISTS {$this->getTable('pedroteixeira_correios/postmethod')} (
-      method_id int(11) unsigned NOT NULL auto_increment,
-      method_code varchar(5) NOT NULL default '0',
-      method_title varchar(255) NOT NULL default '',
-      PRIMARY KEY (method_id)
-    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;"
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+$tableName = $this->getTable('pedroteixeira_correios/postmethod');
+$table = $installer->getConnection()
+    ->newTable($tableName)
+    ->addColumn(
+        'method_id',
+        Varien_Db_Ddl_Table::TYPE_INTEGER,
+        null,
+        array(
+            'identity'  => true,
+            'unsigned'  => true,
+            'nullable'  => false,
+            'primary'   => true,
+        ),
+        'ID'
+    )->addColumn(
+        'method_code',
+        Varien_Db_Ddl_Table::TYPE_TEXT,
+        5,
+        array(
+            'nullable'  => false,
+            'default'   => '0'
+        ),
+        'Code'
+    )->addColumn(
+        'method_title',
+        Varien_Db_Ddl_Table::TYPE_TEXT,
+        255,
+        array(
+            'nullable'  => false,
+            'default'   => ''
+        ),
+        'Title'
+    )->addIndex(
+        $installer->getIdxName(
+            $tableName,
+            array('method_code'),
+            Varien_Db_Adapter_Interface::INDEX_TYPE_UNIQUE
+        ),
+        array('method_code'),
+        array('type' => Varien_Db_Adapter_Interface::INDEX_TYPE_UNIQUE)
+    );
+$installer->getConnection()->createTable($table);
+
+$services = array(
     array(
-        'method_id'    => '3',
         'method_code'  => '40045',
         'method_title' => 'SEDEX A COBRAR SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '4',
         'method_code'  => '40215',
         'method_title' => 'SEDEX 10 SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '5',
         'method_code'  => '40290',
         'method_title' => 'SEDEX HOJE SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '6',
         'method_code'  => '04510',
         'method_title' => 'PAC SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '7',
         'method_code'  => '04014',
         'method_title' => 'SEDEX SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '8',
         'method_code'  => '04669',
         'method_title' => 'PAC CONTRATO AGENCIA',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '9',
         'method_code'  => '04162',
         'method_title' => 'SEDEX CONTRATO AGENCIA',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '10',
         'method_code'  => '04693',
         'method_title' => 'PAC CONTRATO GRANDES FORMATOS',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
+    ),
     array(
-        'method_id'    => '11',
         'method_code'  => '10065',
         'method_title' => 'CARTA COMERCIAL A FATURAR',
     )
 );
 
+foreach ($services as $service) {
+    $installer->getConnection()->insertOnDuplicate($tableName, $service, array('method_code'));
+}
+
 $installer->endSetup();
diff --git a/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/upgrade-4.7.2-4.8.0.php b/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/upgrade-4.7.2-4.8.0.php
index c447d70..0f189ac 100644
--- a/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/upgrade-4.7.2-4.8.0.php
+++ b/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/upgrade-4.7.2-4.8.0.php
@@ -11,99 +11,3 @@
  * @license   http://opensource.org/licenses/MIT MIT
  * @link      https://github.com/pedro-teixeira/correios
  */
-
-/* @var $installer Mage_Core_Model_Resource_Setup */
-$installer = $this;
-$installer->startSetup();
-
-$installer->run(
-    "CREATE TABLE IF NOT EXISTS {$this->getTable('pedroteixeira_correios/postmethod')} (
-      method_id int(11) unsigned NOT NULL auto_increment,
-      method_code varchar(5) NOT NULL default '0',
-      method_title varchar(255) NOT NULL default '',
-      PRIMARY KEY (method_id)
-    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;"
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
-    array(
-        'method_id'    => '3',
-        'method_code'  => '40045',
-        'method_title' => 'SEDEX A COBRAR SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
-    array(
-        'method_id'    => '4',
-        'method_code'  => '40215',
-        'method_title' => 'SEDEX 10 SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
-    array(
-        'method_id'    => '5',
-        'method_code'  => '40290',
-        'method_title' => 'SEDEX HOJE SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
-    array(
-        'method_id'    => '6',
-        'method_code'  => '04510',
-        'method_title' => 'PAC SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
-    array(
-        'method_id'    => '7',
-        'method_code'  => '04014',
-        'method_title' => 'SEDEX SEM CONTRATO',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
-    array(
-        'method_id'    => '8',
-        'method_code'  => '04669',
-        'method_title' => 'PAC CONTRATO AGENCIA',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
-    array(
-        'method_id'    => '9',
-        'method_code'  => '04162',
-        'method_title' => 'SEDEX CONTRATO AGENCIA',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
-    array(
-        'method_id'    => '10',
-        'method_code'  => '04693',
-        'method_title' => 'PAC CONTRATO GRANDES FORMATOS',
-    )
-);
-
-$installer->getConnection()->insertForce(
-    $this->getTable('pedroteixeira_correios/postmethod'),
-    array(
-        'method_id'    => '11',
-        'method_code'  => '10065',
-        'method_title' => 'CARTA COMERCIAL A FATURAR',
-    )
-);
-
-$installer->endSetup();
diff --git a/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/upgrade-4.8.0-4.8.1.php b/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/upgrade-4.8.0-4.8.1.php
index 0f189ac..2f4cd90 100644
--- a/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/upgrade-4.8.0-4.8.1.php
+++ b/app/code/community/PedroTeixeira/Correios/sql/pedroteixeira_correios_setup/upgrade-4.8.0-4.8.1.php
@@ -11,3 +11,111 @@
  * @license   http://opensource.org/licenses/MIT MIT
  * @link      https://github.com/pedro-teixeira/correios
  */
+
+/* @var $installer Mage_Core_Model_Resource_Setup */
+$installer = $this;
+$installer->startSetup();
+
+$tableName = $this->getTable('pedroteixeira_correios/postmethod');
+
+if ($installer->getConnection()->isTableExists($tableName)) {
+    // Fix old migration to 4.8.0
+    // See https://github.com/pedro-teixeira/correios/pull/252
+    $installer->getConnection()->addIndex(
+        $tableName,
+        $installer->getIdxName(
+            $tableName,
+            array('method_code'),
+            Varien_Db_Adapter_Interface::INDEX_TYPE_UNIQUE
+        ),
+        array('method_code'),
+        array('type' => Varien_Db_Adapter_Interface::INDEX_TYPE_UNIQUE)
+    );
+} else {
+    $table = $installer->getConnection()
+        ->newTable($tableName)
+        ->addColumn(
+            'method_id',
+            Varien_Db_Ddl_Table::TYPE_INTEGER,
+            null,
+            array(
+                'identity'  => true,
+                'unsigned'  => true,
+                'nullable'  => false,
+                'primary'   => true,
+            ),
+            'ID'
+        )->addColumn(
+            'method_code',
+            Varien_Db_Ddl_Table::TYPE_TEXT,
+            5,
+            array(
+                'nullable'  => false,
+                'default'   => '0'
+            ),
+            'Code'
+        )->addColumn(
+            'method_title',
+            Varien_Db_Ddl_Table::TYPE_TEXT,
+            255,
+            array(
+                'nullable'  => false,
+                'default'   => ''
+            ),
+            'Title'
+        )->addIndex(
+            $installer->getIdxName(
+                $tableName,
+                array('method_code'),
+                Varien_Db_Adapter_Interface::INDEX_TYPE_UNIQUE
+            ),
+            array('method_code'),
+            array('type' => Varien_Db_Adapter_Interface::INDEX_TYPE_UNIQUE)
+        );
+    $installer->getConnection()->createTable($table);
+
+    $services = array(
+        array(
+            'method_code'  => '40045',
+            'method_title' => 'SEDEX A COBRAR SEM CONTRATO',
+        ),
+        array(
+            'method_code'  => '40215',
+            'method_title' => 'SEDEX 10 SEM CONTRATO',
+        ),
+        array(
+            'method_code'  => '40290',
+            'method_title' => 'SEDEX HOJE SEM CONTRATO',
+        ),
+        array(
+            'method_code'  => '04510',
+            'method_title' => 'PAC SEM CONTRATO',
+        ),
+        array(
+            'method_code'  => '04014',
+            'method_title' => 'SEDEX SEM CONTRATO',
+        ),
+        array(
+            'method_code'  => '04669',
+            'method_title' => 'PAC CONTRATO AGENCIA',
+        ),
+        array(
+            'method_code'  => '04162',
+            'method_title' => 'SEDEX CONTRATO AGENCIA',
+        ),
+        array(
+            'method_code'  => '04693',
+            'method_title' => 'PAC CONTRATO GRANDES FORMATOS',
+        ),
+        array(
+            'method_code'  => '10065',
+            'method_title' => 'CARTA COMERCIAL A FATURAR',
+        )
+    );
+
+    foreach ($services as $service) {
+        $installer->getConnection()->insertOnDuplicate($tableName, $service, array('method_code'));
+    }
+}
+
+$installer->endSetup();