AK400 upgrade-AK500 (remote network upgrades, more powerful, more advanced technology ) AK500 Product Description: 1; support the matching of the infrared Benz "Keylsee go" function; 2; to support key end-of-life Benz BMW + Recovery, the world's leading technology; 3; the exclusive Mercedes-Benz 722.9 solve computer gear shift control and running the computer authorized to global problems, global unique technology. 4; support...