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Content 4/4

eMMC test board adapter was developed specifically for owners of the Z3X box (for the first revision box), which is used in the repair of mobile phones.

Adapter allows to work with eMMC/MCP memory IC's in BGA169/153, BGA162/186, BGA221, BGA529 packages.


The adapter can operate in two modes:

1) IO/ISP mode: Connection to Z3X box. Adapter can be powered both from the box itself, and from the computer’s USB port or from the 5V power supply. In this case possible to work with the eMMC via 1-bit bus.

Following functions are available in this mode:

  • recovery firmware eMMC controller
  • work with EXT CSD register block
  • resizing eMMC partitions
  • full erasing and formatting eMMC partitions
  • read/write/erase ROM2 and ROM3 partitions
  • read/write/erase ROM1 (Main User Data) partition
  • creation and work with GP partitions

Adapter allows to work with eMMC IC's in-circuit (ISP mode).

2) USB mode: Adapter directly connects to the computer through via USB port without a Z3X box. In this case available work with ROM1 (Main User Data) partition - read/write/erase/format. eMMC connects to USB port via a card reader single chip GL827L on 8-bit bus, thereby increasing read/write speed, which saves time when working with large amounts of data. It is possible to use the adapter as an ordinary microSD/TF card reader. For this purpose, the board have microSD/TF connector.


Adapter board there are switches for the supply voltage eMMC: Vccq 1.2/1.8 /2.8/3.3v, VCC 2.8/3.3v. All adapter work modes have a LED indications.


Adapter board does not contain scarce and high-priced parts. BOM reference



Photo of the assembled adapter (this is a photo of an early revision of the board, which i use in my job. New revision does not have any fundamental differences, only some cosmetic). The photo shows that there is no GL827L IC installed on the board (since I do not use the USB mode. I do not need it yet).


Schematics diagram and table of installation reference



Mar 27,2019
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    • Omer Faruk Ucar from TURKEY
      Founder of the project ‘Lezzetli Robot Tarifleri’ In the frame of this project he produces Turkish contents about electronics/software and serves it to people for free. He produced many jammer devices mostly drone dropper weapons while working in electronic defense industry. He gave lessons to teachers about software and electronics in a program which supported by the government. And now he is working as a hardware engineer on SCADA systems syber security.
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    • Ever since I was a kid, I love tinkering with anything that involves energy from toys to cellphones. I love designing and creating projects that could be innovative with the use of electronics. I was also appointed team leader of the University of Sto. Tomas team for the Shell Eco-marathon Philippines Competition in 2018.
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      My name is José Ramón Pueyo, I live in Spain. For more than 40 years he has worked in the radio communication sector, mainly with RF equipment and developing control and monitoring systems.Five years ago I opened a channel on YouTube (J_RPM) in order to share some developments and divulge technical information.
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