Easy Jtag / Easy Jtag Plus

Easy Jtag / Easy Jtag Plus — Professional eMMC & UFS Programmer

5 min read

What is Easy-JTAG Plus?

Easy-JTAG Plus (by Z3X Team) is a professional hardware-level (JTAG/ISP/eMMC/UFS) repair tool — one of the most powerful tools in the GSM industry. Unlike software tools that communicate with the phone's processor through USB, Easy-JTAG Plus connects directly to the phone's memory chip (eMMC or UFS) to read, write, and repair data at the lowest possible level.

What is JTAG / ISP?

JTAG (Joint Test Action Group): An interface originally designed for testing PCBs. In phone repair, JTAG connects to test points on the motherboard to access the processor and memory directly. Used on older devices (pre-2015)
ISP (In-System Programming): Modern replacement for JTAG. Connects directly to the eMMC/UFS memory chip's data/clock/cmd pins (soldering wires to tiny pads) while the chip stays on the board
eMMC Direct: Reads/writes the eMMC chip via Easy-JTAG's built-in eMMC adapter. Can work with chip removed from board (for BGA rework scenarios)
UFS Direct: Same concept for UFS (Universal Flash Storage) chips used in modern flagship phones since ~2018

Why Hardware-Level Access Matters

When software methods fail — phone completely dead, no USB response, no boot ROM mode, corrupted firmware, locked with unknown accounts — Easy-JTAG Plus can still access the storage chip to:

Operation	Detail
Full Dump Read	Read entire storage content (all partitions) as raw binary. Used for forensics, data recovery, and backup before risky operations
Full Dump Write	Write/restore a full dump back to the chip. Restores a bricked phone to working state from backup
Partition Management	Read/write individual partitions: boot, system, userdata, EFS (Samsung), NVRAM (MTK), persist, frp
FRP/Account Removal	Erase FRP and account partitions directly from storage chip — works even when phone won't boot
IMEI Repair	Write EFS/NVRAM partitions directly to storage — works on dead phones
eMMC/UFS Repair	Fix corrupted eMMC firmware, repair GPT (partition table), resize partitions, change eMMC configuration registers
Dead Boot Recovery	Rewrite boot/recovery partitions on completely dead phones that won't enter any boot mode

Storage Chip Support

Type	Brands	Capacities
eMMC 4.4/4.5/5.0/5.1	Samsung, SK Hynix, Toshiba/KIOXIA, Micron, SanDisk/WD, Kingston	4GB to 256GB
UFS 2.0/2.1/3.0/3.1/4.0	Samsung, SK Hynix, KIOXIA, Micron, WD	32GB to 1TB

Easy-JTAG Plus Hardware

The Easy-JTAG Plus box includes:

Main box: Contains FPGA/MCU that handles direct eMMC/UFS communication at hardware speed (not through USB serial)
ISP adapters: Various cables/clips for connecting to different board layouts
eMMC socket: BGA socket adapter for reading removed eMMC chips
UFS socket (optional): BGA socket for UFS chips

The software supports Z3X Shell interface and requires periodic software updates for new device/chip support.

How to Use Easy-JTAG Plus: Step-by-Step

Purchase Easy-JTAG activation/renewal from Code-GSM
Connect the Easy-JTAG Plus box to PC via USB
Install drivers and software
Launch the Easy-JTAG Plus software
Connect the target device:
- ISP (In-System Programming): Solder or clip wires to eMMC/UFS ISP pads on the phone's motherboard
- Direct eMMC/UFS: Desolder the memory chip → use socket adapter on the box
- USB connection: For supported chipsets, some operations work via USB only
Detect and identify the eMMC/UFS chip
Choose operation: Read, Write, Erase, Repair, JTAG Boundary Scan
Execute

Tutorial: ISP Connection for Phone Repair

Disassemble the phone to expose the motherboard
Locate ISP pads: Find CMD, CLK, DAT0, VCC, GND pads — use your model's ISP pinout diagram
Solder thin wires (0.1mm enameled copper wire works best) to each ISP pad
Connect wires to the Easy-JTAG adapter in the correct order
In software: Click "Detect" — the eMMC/UFS chip type and size should appear
Read full dump first as backup — save to PC
Perform repair: Write firmware, fix partition table, repair NVRAM, clear FRP, or restore from dump

When to Use Easy-JTAG vs Software Tools

Use Easy-JTAG when: Phone is completely dead, no USB response, software tools cannot detect the device, or you need to access raw memory directly
Use software tools when: Phone enters some mode (Download, Fastboot, EDL, BROM) — faster and less risk than ISP
ISP is hardware-level access — it bypasses all software security. It can recover devices that no other method can reach
Risk: Soldering to ISP pads requires micro-soldering skill. Bad connections cause data corruption or board damage

Browse Easy-JTAG Plus at Code-GSM

Easy-JTAG ISP/eMMC Connection Methods

Method	Description	Required Skills
ISP (via test points)	Solder thin wires to eMMC ISP pads on the PCB (CMD, CLK, DAT0, DAT1, DAT2, DAT3, RST, VCC, GND). Connect wires to Easy-JTAG ISP socket. Read/write without desoldering chip	Soldering, PCB reading skills to identify ISP pads
eMMC socket (chip off)	Desolder the eMMC chip → place in the Easy-JTAG eMMC socket (153-BGA, 169-BGA, or 221-BGA). Read full chip dump	Hot air rework station, BGA soldering skills
UFS socket (chip off)	Desolder UFS chip → place in UFS BGA socket on Easy-JTAG Plus. Required for Qualcomm flagships, Samsung Galaxy S/Note/Z series	Advanced BGA rework with precision alignment
JTAG (legacy)	Connect to JTAG pins on PCB (TDI/TDO/TMS/TCK/TRST). Used for older devices (2010-2015 era)	PCB knowledge, older device experience

Troubleshooting Easy-JTAG Plus

Problem	Cause	Solution
eMMC chip not detected in socket	Chip not fully seated, wrong BGA pin count socket, or chip damaged during removal	Re-seat the chip carefully — all 153/169 BGA balls must align. Verify you have the correct socket (different eMMC have different BGA packages). Inspect chip balls under microscope for damage
ISP read gives CRC errors or partial data	Poor ISP wire connections, wire too long (signal integrity), or inadequate power supply at VCC	Use high-quality magnet wire for ISP. Keep wires as short as possible (<5cm). Ensure VCC is stable — use the Easy-JTAG's built-in power supply, not a separate probe. Check all 8 ISP connections with continuity tester
Write to eMMC verified but phone still dead/locked	Write was to wrong address/partition offset, or only part of eMMC was written	Verify the full dump (including boot0, boot1, and main user area) was written from the same phone model. Use the Auto Match feature in Easy-JTAG software to verify partition tables
UFS chip read fails completely	UFS socket alignment issue or UFS requires power sequencing	UFS power-on sequencing is critical — VCC must stabilize before VIO. Use Easy-JTAG's UFS power controller. Check alignment: UFS BGA is very fine pitch and one row off will cause total read failure

Frequently Asked Questions — Easy-JTAG Plus

Q: When should I use Easy-JTAG vs a software tool (like UFED/Cellebrite)?
A: Easy-JTAG is used when: (1) the phone is completely dead (no power); (2) software/USB approaches have all failed; (3) the eMMC or UFS chip itself needs data recovery or re-flash; (4) advanced IMEI repair at chip level. Software tools work on a live, communicating device. JTAG/ISP works on a dead or non-responding device at hardware level.

Q: What is the difference between eMMC and UFS?
A: eMMC (embedded Multi-Media Card) — older/budget storage interface (serial, lower bandwidth). Used in most budget Android phones before 2020. UFS (Universal Flash Storage) — faster, parallel interface. Used in all modern flagships (Samsung S/Note/Z, Xiaomi/POCO flagships, OPPO/Vivo flagships). Easy-JTAG Plus supports both via different sockets.

Q: Can I restore a phone from an eMMC dump made on a different unit?
A: Not safely — eMMC dumps contain IMEI, EFS/NV data, device serial numbers, and encryption keys unique to the donor phone. Writing a dump from a different phone will transfer the donor's identity. The correct usage is: read a backup from the SAME phone, repair it, then write it back to the same phone.

Q: What is the advantage of Easy-JTAG Plus over Easy-JTAG classic?
A: Easy-JTAG Plus added a UFS socket (required for modern flagships), expanded ISP support for newer SoCs, a built-in power supply (stable VCC/VIO), expanded chipset programmer database, and improved software with more chipset profiles. The "Plus" is the current standard and required for UFS (Samsung S10+ and later, most modern flagships).

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