P5100 repair with z3x easy jtag

i have a tab2 P5100 that is always restarting after reaches the android meniu. Tried to do factory reset, reflash but the tablet is always returning to the old state as i have done nothing to it. I just bought Z3X easy jtag and Easy Jpin set. I always recive the folowing error:

Z3X EasyJtag Software ver.
Loading eMMC Addon Firmware… IO: 1800 mV
Box S/N: 01FFF01F732B82A8, ,FW Ver.: 01.55
CMD Pullup Level:371 mV
CMD Active Level:1907 mV
Box IO Level:1800 mV
CLK Rate:14000 khz
HiPower™ mode is off!
Can’t init device, Reason: CMD Timeout Error

As i said i just bought this box and do not know realy how to use it. Can you please help me?
I want to try reflash the emmc see if i can solve the problem.