Did you try contacting Smartdevices directly?
As the manufacturer they should honor the warranty even if the seller refuses to do so.
edit : contact info
Address: 6 Floor, Digital Media Building, No.7 Information Road, Shangdi Information Industry Base,Beijing,China
Postal code: 100085
Telephone：
+86-10-62971109
+86-10-82127146
WebSite：
http://www.smartdevices.com.cn
E-mail:sales@smartdevices.com.cn