In this post, we will provide working and tested Samsung Galaxy S25 FE SM-S731B UFS ISP pinout, which will be useful to advanced mobile repair technicians. The ISP pinout is extremely important when performing direct UFS chip programming, bypassing FRP, removing MDM or user lock status, recovering lost data, and repairing dead boot conditions.
As mobile technicians or micro soldering specialists, we encounter devices that are bricked, locked, or not being detected on a PC. In this situation, the ISP connection comes into play, which is connected directly to the UFS Chip. In this post, we will present the tested and verified Samsung Galaxy S25 FE ISP Pinout, what it is, and how to connect and easily do your repair and recovery tasks with it.
What is the Samsung Galaxy S25 FE SM-S731B ISP Pinout?
In simple terms, ISP allows you to access the EMMC chip without having to remove it. You simply need to identify the appropriate pinout of the board and utilize a supported UFS, EMMC tool, such as UFI, Easy JTAG, or Medusa Pro, to attach it directly.
Isp Pinout is useful when:
- Phone is dead (black screen, no boot, no charging)
- FRP is locked, and you can’t use ADB, fastboot, or OTG bypass
- You need to dump firmware from a working unit to repair a dead one
- You’re working on a boot repair or partition restore
- Phone is detected as “unknown” in PC (EDL not working)
Samsung Galaxy S25 FE UFS ISP Pinout Image:
Here’s where things get technical. The Samsung Galaxy S25 FE shares a hardware layout with several models, but the actual pin locations can vary slightly. You’ll find the ISP points near the UFS chip under the metal shield.
UFS ISP Pin Labels You Need:
TXOP
TXON
RXOP
RXON
GND – Ground
📲 Device Info:
• Model: Samsung Galaxy S25 FE
• Codename : [SM-S731B]
• Storage Type: 128GB: UFS 3.1 256GB: UFS 4.0 512GB: UFS 4.0
• CPU: Exynos 2400 (4 nm)
• OS: Android 16, up to 7 major Android upgrades, One UI 8
💡 Tip: Use a microscope or a 10x magnifier to identify the points correctly. Don’t rely solely on diagrams—confirm the layout visually.
When repairing dead boot problems, especially for devices like the Samsung Galaxy S25 FE, the Easy JTAG Plus and UFI Box dongles are great for mobile repair. They are important for scenarios where the phone has been incorrectly flashed and does not display the startup logo, and is no longer responding to power.
Required Tools for ISP Pinout:
- Make sure your bench is set up with the right tools before jumping in:
- UFI Box, Easy JTAG, or Medusa Pro
- 0.1mm – 0.3mm jumper wire
- Fine tip soldering iron
- Isopropyl Cleaner (IPA 99%)
- Soldering flux
- Multimeter (for checking continuity)
How to Connect ISP to the EMMC Box
- Remove the battery from the phone – extremely important to prevent voltage conflicts.
- Clean the PC board area using isopropyl alcohol.
- Connect jumper wires to CLK, TXON, TXOP, GND, and RXON, RXOP with care using solder.
- Connect the wires to your UFS, EMMC tool, following the tool’s pinout.
- Double-check each wire using a multimeter to ensure there are no shorts.
- Connect to UFI or Easy JTAG,
- In the UFI or Easy Jtag Software:
- Select Identify UFS eMMC
- Now Use the Operation you Want: User Partition – Special Task – Reset FRP
✅ If you have the right connection, you will see the UFS chip information in the tool window.
