After placing an order for your VENTUS NBV4 pixel saber, did you realize you wanted the PRIZM 5.1 version instead? Pay for the upgrade here, and we'll make sure you get the PRIZM 5.1 installed in your hilt. Please add your previous order number to the special instructions box when you click view cart. This way we know which hilt to upgrade. You may choose this option without contacting us until March 23rd, 2018. Afterwards, please contact us first to see if your order is still not far along enough to receive the upgrade.