s8530 and download mode help

hi to dear taem



i have a s8530 with show only logo so i checking boot repair but this time after full erase and easy repair mode only show blue screen so i cannot start download mode:

Quote:

Welcome to Medusa Box Software version 2.4.1 Selected device model: Samsung GT-S8530 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 S64 revision C. Detected TAP ID: 1BA00477, IR Length = 4. JTAG speed : 12000 KHz. VREF level : 2.75 V CPU : Samsung S5PC110 Core ID : 1BA00477 Flash device: Samsung OneNAND KFG4GH6Q4M Flash ID : 00EC0050 Page size : 4096 bytes Block size : 64 pages (256 Kb) Block count: 2048 Flash size : 512 Mb Write protection disabled. Connect successful. ECC Mode enabled. Erasing BOOT section. Please wait... Done Erasing FIRMWARE section. Please wait... Done Disconnected Selected device model: Samsung GT-S8530 Connecting. Please wait... Checking data... Medusa JTAG Firmware version 1.1.0. Medusa JTAG Hardware S64 revision C. Detected TAP ID: 1BA00477, IR Length = 4. ERROR[000]: Unable to halt core. Please connect the target device and power it on... Checking data... Medusa JTAG Firmware version 1.1.0. Medusa JTAG Hardware S64 revision C. Detected TAP ID: 1BA00477, IR Length = 4. JTAG speed : 12000 KHz. VREF level : 2.75 V CPU : Samsung S5PC110 Core ID : 1BA00477 Flash device: Samsung OneNAND KFG4GH6Q4M Flash ID : 00EC0050 Page size : 4096 bytes Block size : 64 pages (256 Kb) Block count: 2048 Flash size : 512 Mb Write protection disabled. Opening "G:\medusabox\firmware\sam\S\s8530\SAMSUNG_GTS8530 _Repair.mf" file... Writing BOOT section. Please wait... Done Writing UPCH section. Please wait... Done Repairing IMEI... Done Disconnected Repair done.

plz help me

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