Device connecting problem [Answered]

device power supply.
Medusa JTAG Firmware version 1.24.
Detected TAP ID: 62286041, IR Length = 6.
JTAG speed : 2400 KHz.
VREF level : 1.76 V
CPU : ST-Ericsson U8500
Core ID : 4BA00477
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...
Checking data...
Resetting target. Please wait...
VREF = 1.74V is less than required level. Please check target device power supply.
Medusa JTAG Firmware version 1.24.
Detected TAP ID: 62286041, IR Length = 6.
JTAG speed : 2400 KHz.
VREF level : 1.74 V
CPU : ST-Ericsson U8500
Core ID : 4BA00477
ERROR[004]: Medusa Device Server did not replied to HELLO command.
Checking data...
Resetting target. Please wait...
VREF = 1.74V is less than required level. Please check target device power supply.
Medusa JTAG Firmware version 1.24.
Detected TAP ID: 62286041, IR Length = 6.
JTAG speed : 2400 KHz.
VREF level : 1.74 V
CPU : ST-Ericsson U8500
Core ID : 4BA00477
ERROR[008]: Unknown flash device. Device No:ID = 0:00000000.
ERROR[035]: Target device has been powered off during connect.
Checking data...
Resetting target. Please wait...
VREF = 1.74V is less than required level. Please check target device power supply.
Medusa JTAG Firmware version 1.24.
Detected TAP ID: 62286041, IR Length = 6.
JTAG speed : 2400 KHz.
VREF level : 1.74 V
CPU : ST-Ericsson U8500
Core ID : 4BA00477
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...
Checking data...
Resetting target. Please wait...
VREF = 1.74V is less than required level. Please check target device power supply.
Medusa JTAG Firmware version 1.24.
Detected TAP ID: 62286041, IR Length = 6.
JTAG speed : 2400 KHz.
VREF level : 1.74 V
CPU : ST-Ericsson U8500
Core ID : 4BA00477
ERROR[004]: Medusa Device Server did not replied to HELLO command.
Checking data...
Resetting target. Please wait...
VREF = 1.74V is less than required level. Please check target device power supply.
Medusa JTAG Firmware version 1.24.
Detected TAP ID: 62286041, IR Length = 6.
JTAG speed : 2400 KHz.
VREF level : 1.74 V
CPU : ST-Ericsson U8500
Core ID : 4BA00477
ERROR[008]: Unknown flash device. Device No:ID = 0:00000000.
ERROR[035]: Target device has been powered off during connect.
Selected device model: Samsung GT-I8190
Connecting. Please wait...
Checking data...
Resetting target. Please wait...
VREF = 1.74V is less than required level. Please check target device power supply.
Medusa JTAG Firmware version 1.24.
MI: Medusa JTAG init failed.
Selected device model: Samsung GT-I8190
Connecting. Please wait...
Checking data...
Resetting target. Please wait...
VREF = 1.74V is less than required level. Please check target device power supply.
Medusa JTAG Firmware version 1.24.
MI: Medusa JTAG init failed.
Selected device model: Samsung GT-I8190
Connecting. Please wait...
Checking data...
Resetting target. Please wait...
VREF = 1.74V is less than required level. Please check target device power supply.
Medusa JTAG Firmware version 1.24.
MI: Medusa JTAG init failed.
Selected device model: Samsung GT-I8190
Connecting. Please wait...
Checking data...
Resetting target. Please wait...
VREF = 1.74V is less than required level. Please check target device power supply.
Medusa JTAG Firmware version 1.24.
Detected TAP ID: 62286041, IR Length = 6.
JTAG speed : 2400 KHz.
VREF level : 1.74 V
CPU : ST-Ericsson U8500
Core ID : 4BA00477
ERROR[004]: Medusa Device Server did not replied to HELLO command.
Selected device model: Samsung GT-I8190
Connecting. Please wait...
Checking data...
Resetting target. Please wait...
VREF = 1.74V is less than required level. Please check target device power supply.
Medusa JTAG Firmware version 1.24.
Detected TAP ID: 62286041, IR Length = 6.
JTAG speed : 2400 KHz.
VREF level : 1.74 V
CPU : ST-Ericsson U8500
Core ID : 4BA00477
ERROR[008]: Unknown flash device. Device No:ID = 0:00000000.
ERROR[035]: Target device has been powered off during connect.
FATAL: Error during device creation.