This link is from sales-cooperation partner of XIAOMI, not XIAOMI offical web, are you sure to go to that page?
4 steps to use Exchange Coupon
Mi Exchange FAQs
How do I avail the Exchange Offer?
How do I send my old phone back?
My phone is listed as eligible and exchange is available in my location. Are there any more conditions to avail the offer?
Should the device be in working condition to qualify for this offer?
Coupon redemption rules
Pre-order to secure signature Mi product(s)
Purchase and make payment now. Expected to ship within 1 week
To minimize scalper activities and protect the interests of Mi fans, delivery address cannot be changed
In the event of product price adjustment prior to delivery, price of paid orders will not be affected