cannot install the system update

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http://forum.xda-developers.com – hi my HOX cannot install the new system update over OTA for ASia device. when i install update it goes to the cockwork recovery .So i try to revert it to Stock recovery but when i start the bootloader and connect it to my Laptop , it show the message like "failed to open usb master mode..." check the link below for the image abload.de/image.php?img=vlcsnap-2012-04-25-2152ut6.png. So plz help me thanks (HowTos)