Can’t init EMMC, Reason: CMD Timeout Error

Hi Guys,

I am new to this forum so first let me say "Hi Everyone".

I am having this problem all the time (and I do mean all the time). I have tried 6 different (working) phones and 2 tabs and ALL come out with this error:

Z3X EasyJtag Software ver.
Loading eMMC Addon Firmware… IO: 2050 mV
CMD Pullup Level:1330 mV
CMD Active Level:1784 mV
Can’t init EMMC, Reason: CMD Timeout Error

I have spent hours looking through this forum and online but can only find other people with the same problem and no solution such as

I am using a Z3X pro box and Z3X EasyJTag box but both have the same problem (after the first box broke I got a replacement and the replacement was able to detect the Emmc before that too came up with the same error). They worked at first (for about 3 or 4 times) but then just kept coming up with the same problem.

I have tried Windows 7 and Windows 10.

I have shorted pins 3, 9 and 11 on the Z3X pro box.

The ISP connections are perfect

The EMMC chips are working fine

I have tried providing external power (from a dedicated power supply)

The adapter Im using is the: EMMC adapter for Easy JTAG Box (Z3X-Pro) by GPG

I have completely reinstalled my PC, re-installed latest software and firmware, reset firmware on the Z3x box.

With a number of people having this problem, there must be someone who can provide an answer (other than the EMMC needs replacing)

Please please please help

Is there a way to reset the Z3X box back to factory settings


  • cmd error easy jtag