Samsung Galaxy M13 SM-M135F/U EMMC ISP Solution

The Samsung Galaxy M13 SM-M135F/U can be fully repaired or restored using the eMMC ISP method, providing a reliable solution for dead boot issues, FRP locks, or firmware corruption

By carefully locating the eMMC test points beneath the metal shield, technicians can directly interface with the chip using tools like UFI Box, Easy JTAG, or Medusa Pro. This approach allows you to read, write, or reset partitions without removing the eMMC from the board, minimizing the risk of damage.

Post Index:Following proper cleaning, precise soldering, and verified wiring ensures a stable connection, enabling operations such as stock ROM restoration, FRP bypass, or user data reset. With the correct setup, the device can be fully recovered even when standard flashing or EDL modes fail, making ISP a critical solution for hardware-level mobile repair.

Samsung Galaxy M13 SM-M135F/U EMMC

This guide shows the ISP (test point) pinout for the Samsung Galaxy M13 (SM-M135F/U) with clear images and step-by-step instructions. Using the ISP pinout you can restore the stock ROM, bypass FRP, or reset user data via a UFi Box. I’ll also explain how to reboot the device into Download Mode, list the tools you’ll need, share connection tips, and cover common fixes—everything based on hands-on experience.

⚙️ What is ISP (In-System Programming)?

In short, ISP lets you access the eMMC chip while it’s still on the board — no desoldering required. You just locate the board’s eMMC test-point pinout and connect a compatible eMMC tool (for example UFI, Easy JTAG, or Medusa Pro) to communicate with the chip directly.

🔌 When Is the ISP Pinout Useful

The ISP pinout comes in handy in several situations, such as when:

The phone is dead (black screen, no boot, no charging)

FRP is locked and ADB, Fastboot, or OTG methods don’t work

You need to extract firmware from a working device to fix a dead one

You’re performing a boot repair or restoring corrupted partitions

Also read: Samsung S25 Ultra SM-S938B/U ISP Pinout Solution

The phone is detected as “unknown” on a PC and EDL mode isn’t responding

📸 Samsung Galaxy M13 SM-M135F/U ISP eMMC Pinout Image

Now for the technical part — the Samsung Galaxy M13 SM-M135F/U shares its hardware layout with a few related models, but the exact ISP pin locations can differ slightly. The test points are usually found near the eMMC chip, located beneath the metal shield on the motherboard.

📝 EMMC ISP Pin Labels You Need

When working with the ISP connection, these are the key eMMC pins you’ll use:

CMD – Command line

CLK – Clock signal

DAT0 – Data line 0

VCC / VCCQ – eMMC power supply

GND – Ground

💡 Tip: Always use a microscope or at least a 10x magnifier to accurately identify the test points. Don’t rely solely on diagrams—verify the layout visually before making any connections.

When fixing dead boot issues on devices like the Samsung Galaxy M13 SM-M135F/U, tools such as Easy JTAG Plus and UFI Box are extremely useful for mobile repair. They are especially important in cases where the phone has been incorrectly flashed, fails to show the startup logo, and no longer responds to power, allowing you to recover the device directly through the eMMC.

🛠️ Required Tools for ISP Pinout

Before starting, make sure your repair bench is equipped with the following tools:

UFI Box, Easy JTAG, or Medusa Pro

0.1mm – 0.3mm jumper wires

Fine-tip soldering iron

Isopropyl alcohol (IPA 99%) for cleaning

Soldering flux

Multimeter for checking continuity

🔌 How to Connect ISP to an EMMC Box

Open the back panel of the Samsung Galaxy M13 (or related device).

Carefully disassemble the phone to access the motherboard.

Locate the eMMC chip on the PCB.

Clean the area around the chip thoroughly with isopropyl alcohol.

Using jumper wires, carefully solder connections to CLK, TXON, TXOP, GND, RXON, and RXOP. Ensure all connections are secure and precise to avoid damage.

Connect the jumper wires to your UFS or eMMC tool according to the tool’s pinout.

Double-check each connection with a multimeter to ensure there are no shorts.

Attach the tool to the device using UFI Box or Easy JTAG.

Also read: Samsung S23 Ultra SM-S918B EMMC ISP PinOUT

In the UFI or Easy JTAG software, select “Identify UFS/eMMC”.

Once the chip is correctly detected, choose the operation you need, such as User Partition, Special Task, or Reset FRP. ✅