why this happened s6810???

CPU : Broadcom BCM21654
Core ID : 4BA00477
Storage Device: Samsung eMMC N5U00M
Device ID : 00150001
Block size : 512 bytes
Blocks : 7634944
Storage size : 3728 Mb
Opening "C:\Program Files\Octoplus\Octoplus_JTAG\Firmware\SAMSUNG_GTS6 810_Repair.mf" file…
Writing BOOT section. Please wait…
ERROR[018]: Logical block operation failed at 16 Kb (Hex address 0x00004000). Reason: Command failed.
Checking data…
Medusa JTAG Firmware version 1.1.0.
Medusa JTAG Hardware S256 revision D.
Detected TAP ID: 4BA00477, 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 S256 revision D.
Detected TAP ID: 4BA00477, IR Length = 4.
ERROR[000]: Unable to halt core.
Checking data…
Medusa JTAG Firmware version 1.1.0.
Medusa JTAG Hardware S256 revision D.
Detected TAP ID: 4BA00477, IR Length = 4.
ERROR[000]: Unable to halt core.
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: 4BA00477, IR Length = 4.
JTAG speed : 1000 KHz.
VREF level : 1.80 V
CPU : Broadcom BCM21654
Core ID : 4BA00477
Storage Device: Samsung eMMC N5U00M
Device ID : 00150001
Block size : 512 bytes
Blocks : 7634944
Storage size : 3728 Mb
Opening "C:\Program Files\Octoplus\Octoplus_JTAG\Firmware\SAMSUNG_GTS6 810_Repair.mf" file…
Writing BOOT section. Please wait…
ERROR[018]: Logical block operation failed at 16 Kb (Hex address 0x00004000). Reason: Command failed.
Checking data…
Medusa JTAG Firmware version 1.1.0.
Medusa JTAG Hardware S256 revision D.
Detected TAP ID: 4BA00477, 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 S256 revision D.
Detected TAP ID: 4BA00477, IR Length = 4.
ERROR[000]: Unable to halt core.
Checking data…
Medusa JTAG Firmware version 1.1.0.
Medusa JTAG Hardware S256 revision D.
Detected TAP ID: 4BA00477, IR Length = 4.
ERROR[000]: Unable to halt core.
Selected device model: Samsung GT-S6810
Connecting. Please wait…
Checking data…
Medusa JTAG Firmware version 1.1.0.
Medusa JTAG Hardware S256 revision D.
Detected TAP ID: 4BA00477, 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 S256 revision D.
Detected TAP ID: 4BA00477, IR Length = 4.
ERROR[000]: Unable to halt core.
Checking data…
Medusa JTAG Firmware version 1.1.0.
Medusa JTAG Hardware S256 revision D.
Detected TAP ID: 4BA00477, IR Length = 4.
ERROR[000]: Unable to halt core.
Selected device model: Samsung GT-S6810
Connecting. Please wait…
Checking data…
Medusa JTAG Firmware version 1.1.0.
Medusa JTAG Hardware S256 revision D.
Detected TAP ID: 4BA00477, IR Length = 4.
JTAG speed : 2400 KHz.
VREF level : 1.80 V
CPU : Broadcom BCM21654
Core ID : 4BA00477
Storage Device: Samsung eMMC N5U00M
Device ID : 00150001
Block size : 512 bytes
Blocks : 7634944
Storage size : 3728 Mb
Opening "C:\Program Files\Octoplus\Octoplus_JTAG\Firmware\SAMSUNG_GTS6 810_Repair.mf" file…
Writing BOOT section. Please wait…
ERROR[018]: Logical block operation failed at 16 Kb (Hex address 0x00004000). Reason: Command failed.
Checking data…
Medusa JTAG Firmware version 1.1.0.
Medusa JTAG Hardware S256 revision D.
Detected TAP ID: 4BA00477, 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 S256 revision D.
Detected TAP ID: 4BA00477, IR Length = 4.
ERROR[000]: Unable to halt core.
Checking data…
Medusa JTAG Firmware version 1.1.0.
Medusa JTAG Hardware S256 revision D.
Detected TAP ID: 4BA00477, IR Length = 4.
ERROR[000]: Unable to halt core.
Checking data…
Medusa JTAG Firmware version 1.1.0.
Medusa JTAG Hardware S256 revision D.
Detected TAP ID: 4BA00477, 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 S256 revision D.
Detected TAP ID: 4BA00477, IR Length = 4.
ERROR[000]: Unable to halt core.
Checking data…
Medusa JTAG Firmware version 1.1.0.
Medusa JTAG Hardware S256 revision D.
Detected TAP ID: 4BA00477, IR Length = 4.
ERROR[000]: Unable to halt core.