Samsung i9070 boot repair error in easy jtag

hi guys any bady know about this error BUT U8500 Driver Installed also check also in WIN XP – WIN7 but still error coming soldring oki
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Check security…OK
Initialising: SAMSUNG GT-I9070 Config ver.:1.01
I/O Level set to : 2600 mV
Box S/N: 16FFB01016AD966D ,FW Ver.: 01.52
Connecting to Target…
U8500 Connection Fail
Please, install U8500 USB ROM driver, check power and USB connection !!!
U8500 Connection Fail
Please, install U8500 USB ROM driver, check power and USB connection !!!
Done with error(s)..