Default HELP!!!How to upgrade a china made android 4.0.4 phablet to kit kat 4.4

I purchased a china made phablet but it has no option of updating or upgrading the OS. Can anyone please put through how to upgrade my phablet please? The phablet's information are;

Model Number: 86VEBC
Build Number: A13_86VE_M707EBC_1308187.20130831
Kernel Version: 3.0.8+
inet_pmelive@supperFAE #17
Mon Aug 26 17:31:47 CST 2013
Baseband Version: 1.5_130809E
Android Version: 4.0.4

Development Device ID: D5WY-HX4A-JH36-E