Sure! The translation would be:

Friendly reminder: This product cannot be returned or exchanged after it has been opened.

"If the product is deformed or unusable, it can be exchanged or refunded without reason.  
The merchant provides guarantees for product quality, channels, and after-sales service."

This translation maintains clarity while emphasizing the assurances offered by the seller.

Japanese Patent - Cleanses Pores, Massages the Scalp, Exfoliates, Activates Hair Follicles, Prevents Hair Loss, Creates Voluminous Hair Styles, Reduces Static. Product Upgrade: Especially the massage rollers at the back are designed to stimulate meridians, relieve neck fatigue, and promote circulation."

This version translates and refines the message for clarity and impact in a commercial context, while highlighting the unique selling points and advanced features.