Here’s the ISP (eMMC) pinout info for the Vivo Y04 that technicians use for in-system programming, firmware recovery, FRP bypass, and direct EMMC access with tools like UFI Box, Easy JTAG, Medusa Pro, etc.
🔌 Vivo Y04 ISP (eMMC) Pinout – Typical Points
The ISP pinout on Vivo Y04 isn’t a labeled connector like USB; it’s a set of test pads on the motherboard near the eMMC chip (usually under metal shielding). You must locate and solder these points for direct communication.
| Pin Name | Function |
|---|---|
| CMD | eMMC Command (data/control) |
| CLK | Clock signal |
| DAT0 | eMMC Data 0 line |
| VCC / VCCQ | Power supply for eMMC |
| GND | Ground |
These are the essential signals required to communicate with the eMMC chip via most ISP boxes.
📌 What Each Pin Does
- CMD (Command) – Sends commands to the eMMC.
- CLK (Clock) – Timing reference for data transfers.
- DAT0 (Data line 0) – Primary data line used by many tools.
- VCC/VCCQ – Supplies voltage to the memory chip (must match correct level, often around 1.8–3.3 V).
- GND – Reference ground for signals and power.
📍 Locating ISP Pads
- The pads are typically arrayed around the eMMC package on the mainboard.
- A microscope or magnifier is strongly recommended to identify exact pads before soldering.
- These points are unmarked on most boards, so you often need to refer to board pictures or reference layouts from repair guides/files.
⚙️ Steps to Use the ISP Pinout
- Power off phone and disconnect battery.
- Clean the board area with IPA alcohol.
- Solder very fine wires from the ISP pads to the corresponding pins on your ISP programmer.
- Ensure correct mapping of CMD/CLK/DAT0/GND/VCC between phone and ISP tool.
- Double-check continuity with a multimeter.
- Launch the EMMC software and scan the chip.
🧰 Tools Often Used
- UFI Box
- Easy JTAG Plus
- Medusa Pro
- Fine soldering iron and 0.1–0.3 mm wires
- Multimeter and magnifier/microscope
⚠️ Important Tips
- Do not power the phone from USB while trying to solder the ISP points — keep battery disconnected.
- Connect VCC only to the correct eMMC supply pin (mixing power rails can damage the chip).
- ISP pad locations vary slightly depending on board revisions — always confirm visually before soldering.
If you want exact board images with labeled ISP pads for the Vivo Y04, I can help find those references too — just let me know!