SAMSUNG S25 ULTRA S938B-U ISP pinout free

Pinout ISP UFS COMPLETO Samsung Galaxy S25 Ultra S938B/U

Samsung S25 Ultra SM-S938B/U UFS ISP Pinout

📱 Samsung S25 Ultra SM-S938B/U UFS ISP PinOUT Guide

If you're looking to restore stock firmware, bypass FRP lock, or repair a dead Samsung S25 Ultra, then understanding the UFS ISP PinOUT is critical. In this guide, you'll find everything you need—PinOUT images, tools, connection tips, and step-by-step instructions to safely connect your device to a UFI Box, Easy JTAG Plus, or Medusa Pro.

🔧 What is ISP (In-System Programming)?

ISP allows you to access your device’s UFS or eMMC storage directly—without removing the chip. It’s useful for repairing, reading, or writing firmware data via direct hardware connection.

🛠️ When to Use ISP PinOUT?

• Phone is dead (no power or display)
• FRP lock is active with no ADB, fastboot, or OTG access
• Need to dump or clone firmware
• Performing a boot repair or partition restore
• Device not entering EDL and shows as “unknown” on PC

🔍 Samsung S25 Ultra SM-S938B/U ISP PinOUT Overview

The Samsung S25 Ultra (SM-S938B/U) has a UFS chip under the motherboard shield. You’ll need to uncover this to access the ISP points.

🖼️ UFS ISP PinOUT Labels:

• CLK – Clock
• TXOP – Transmit +
• TXON – Transmit –
• RXOP – Receive +
• RXON – Receive –
• GND – Ground

💡 Tip: Always confirm the pinout visually using a magnifier or microscope. Don't rely solely on online diagrams.

🧰 Required Tools for ISP Work

• UFI Box, Easy JTAG Plus, or Medusa Pro
• Jumper wires (0.1mm – 0.3mm)
• Fine tip soldering iron
• 99% Isopropyl Alcohol
• Soldering flux
• Multimeter (for continuity check)
• Microscope or 10x magnifier

🔌 How to Connect UFS ISP to UFI or Easy JTAG

1. Power off and remove battery to avoid voltage issues.
2. Open motherboard shield to expose UFS chip.
3. Clean the area with isopropyl alcohol.
4. Solder jumper wires to: CLK, TXON, TXOP, RXON, RXOP, and GND.
5. Connect to UFI, Easy JTAG, or Medusa according to their pin layout.
6. Use multimeter to ensure no shorts exist.
7. Open UFI/Easy JTAG software and click “Identify UFS”.
8. Perform actions like:
   • Reset FRP
   • Dump firmware
   • Restore partitions
   • Fix dead boot

🔄 How to Enter Download Mode (After Repair)

1. Disconnect the tool and reassemble the device.
2. Insert battery and hold Volume Down + Side/Bixby + USB cable.
3. Release when you see the Download Mode screen.

🧩 Troubleshooting Tips

• No Connection? Check your wires and tool configuration.
• Detected Short? Disconnect everything and test with multimeter.
• Still Not Booting? Flash full ROM or dump from another working unit.

📌 Final Thoughts

Using ISP PinOUT on the Samsung S25 Ultra SM-S938B/U is a powerful way to unbrick, bypass FRP, or restore your device when traditional methods fail. Always use proper tools, double-check your work, and proceed with caution.

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