Hi.. Help error Boot repair samsung gt-i9192

Bienvenido a Medusa Box Software – Versión: 2.6.1
Selected device model: Samsung GT-I9192
Connecting. Please wait…
Checking data…
VREF = 0.0V is less than required level. Please check target device power supply.
Medusa JTAG Firmware version 1.1.0.
Medusa JTAG Hardware S256 revision D.
Detected TAP ID: 000000E1, IR Length = 11.
ERROR[010]: Unsupported device CPU. Core ID = 000000E1.
Please connect the target device and power it on…
Checking data…
Medusa JTAG Firmware version 1.1.0.
Medusa JTAG Hardware S256 revision D.
ERROR[030]: TDO is constant high. Please check target device connection.
MI: Medusa JTAG init failed.
Checking data…
VREF = 0.0V is less than required level. Please check target device power supply.
Medusa JTAG Firmware version 1.1.0.
Medusa JTAG Hardware S256 revision D.
ERROR[030]: TDO is constant high. Please check target device connection.
MI: Medusa JTAG init failed.