need help for s5830i repair boot

hello:



how to solved?













[code][/Selected device model: Samsung GT-S5830i

Connecting. Please wait...

VREF = 0.0V is less than required level. Please check target device power supply.

Medusa JTAG Firmware version 1.1.0.

Medusa JTAG Hardware S64 revision C.

Detected TAP ID: 07B3617F, IR Length = 5.

JTAG speed : Auto (RTCK).

VREF level : 1.79 V

CPU : Broadcom BCM2155

Core ID : 07B3617F

ERROR[008]: Unknown flash device. Device No:ID = 0:00000000.

ERROR[035]: Target device has been powered off during connect.

Please connect the target device and power it on...

Medusa JTAG Firmware version 1.1.0.

Medusa JTAG Hardware S64 revision C.

Detected TAP ID: 07B3617F, IR Length = 5.

JTAG speed : Auto (RTCK).

VREF level : 1.78 V

CPU : Broadcom BCM2155

Core ID : 07B3617F

ERROR[008]: Unknown flash device. Device No:ID = 0:00000000.

ERROR[035]: Target device has been powered off during connect.

Medusa JTAG Firmware version 1.1.0.

Medusa JTAG Hardware S64 revision C.

Detected TAP ID: 07B3617F, IR Length = 5.

JTAG speed : Auto (RTCK).

VREF level : 1.78 V

CPU : Broadcom BCM2155

Core ID : 07B3617F

ERROR[008]: Unknown flash device. Device No:ID = 0:00000000.

ERROR[035]: Target device has been powered off during connect.

code]

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