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What would you like to do?
Magento -update product attribute backend type
$installer = new Mage_Eav_Model_Entity_Setup('core_setup');
$entityTypeId = $installer->getEntityTypeId('catalog_product');
// replace <my_attribute_code> with your attribute code
$idAttribute = $installer->getAttribute($entityTypeId, '<my_attribute_code>', 'attribute_id');
$installer->updateAttribute($entityTypeId, $idAttribute, array(
'backend_type' => 'varchar'
// let's see if it worked
$attribute = Mage::getModel('eav/entity_attribute')->loadByCode('catalog_product', '<my_attribute_code>');

This gist wont work! After the update you can't update the attributes through the admin anymore.

Worked for me! Thanks!

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