Samsung S25 Ultra SM-S938B/U ISP Pinout Solution

The Samsung S25 Ultra SM-S938B/U ISP Pinout Solution provides a direct hardware interface to the UFS storage chip, allowing you to perform advanced repair and data recovery tasks even

when the phone is completely dead or unresponsive. By using the correct ISP test points—typically located near the UFS chip under the protective shield—you can connect professional tools like UFi Box, Easy JTAG Plus, or Medusa Pro to access the internal memory.

Post Index:This connection enables operations such as firmware flashing, boot repair, FRP lock removal, and partition restoration without requiring the phone to boot into download or recovery mode. The SM-S938B/U layout is precision-engineered, so it’s essential to verify each pin (CLK, RX/TX pairs, and GND) visually under a microscope before soldering. When done correctly, this ISP method offers a safe and reliable way to bring your Samsung S25 Ultra back to life or recover critical data.

Samsung S25 Ultra SM-S938B/U ISP Pinout Solution

Easily access the Samsung S25 Ultra (SM-S938B/U) UFS ISP pinout with the step-by-step guide and images below. Using the ISP pinout lets you restore the stock ROM, bypass FRP, or reset user data via a UFi Box. This guide covers the SM-S938B/U ISP pinout, required tools, connection tips, how to reboot into Download Mode, and common troubleshooting fixes—based on hands-on experience.

⚙️ What is ISP (In-System Programming)?

Samsung S25 Ultra SM-S938B/U ISP Pinout In simple terms, ISP (In-System Programming) allows you to access the device’s EMMC or UFS chip without physically removing it from the motherboard. By identifying the correct pinout points on the board, you can connect the chip directly using specialized tools such as UFi Box, Easy JTAG, or Medusa Pro. This method enables direct data access for tasks like firmware restoration, FRP removal, and data recovery.

📍 When Is the ISP Pinout Useful?

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

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

FRP is locked, and you can’t use ADB, Fastboot, or OTG methods to bypass it.

You need to dump firmware from a working device to repair a non-functional one.

You’re performing a boot repair or restoring damaged partitions.

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

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

📸 Samsung S25 Ultra SM-S938B/U UFS ISP Pinout Image

Here’s where things get a bit technical. The Samsung S25 Ultra (SM-S938B/U) shares a similar hardware layout with several other Samsung models, though the exact pin locations may vary slightly. You’ll typically find the ISP test points near the UFS chip, located beneath the metal shield on the motherboard.

🧩 UFS ISP Pin Labels You’ll Need

CLK

TXOP

TXON

RXOP

RXON

GND (Ground)

💡 Pro Tip: Use a microscope or at least a 10x magnifier to correctly identify the ISP points. Avoid relying solely on online diagrams—always confirm the pin layout visually on your specific board.

Samsung S25 Ultra SM-S938B/U ISP Pinout When dealing with dead boot issues—especially on devices like the Samsung S25 Ultra—tools such as the Easy JTAG Plus and UFI Box are essential for professional mobile repair. These tools are particularly useful when a phone has been incorrectly flashed, fails to show the startup logo, or does not respond to the power button at all.

🧰 Required Tools for ISP Pinout

Before getting started, make sure your workbench is properly equipped with the following tools:

UFi Box, Easy JTAG, or Medusa Pro

0.1mm – 0.3mm jumper wire

Fine-tip soldering iron

Isopropyl alcohol (IPA 99%) for cleaning

Soldering flux

Multimeter (to check continuity and connections)

🔌 How to Connect ISP to EMMC/UFS Box

Remove the battery from the device — this is crucial to avoid any voltage conflict or short circuit.

Clean the PCB area around the UFS chip using isopropyl alcohol to ensure a solid connection.

Carefully solder jumper wires to the corresponding pins: CLK, TXON, TXOP, RXON, RXOP, and GND.

Connect the jumper wires to your UFi Box, Easy JTAG, or Medusa Pro according to the specific tool’s pinout diagram.

Before proceeding, double-check each jumper wire with a multimeter to make sure there are no short circuits or loose connections. Once confirmed, connect the device to your UFi Box or Easy JTAG tool.

In the UFi or Easy JTAG software, follow these steps:

Select “Identify UFS/eMMC” to detect the connected chip.

Also read: Samsung A05 SM-A055F/M EMMC ISP Pinout

Once identified, choose the desired operation, such as User Partition → Special Task → Reset FRP.

✅ If your connections are correct, the tool will successfully display the UFS chip information in the software window, confirming that communication with the device has been established.