Samsung Galaxy S25 SM-S931B ISP Pinout Connection (UFS Chip)

If you’re looking for the updated Samsung Galaxy S25 SM-S931B ISP pinout, you came to the right place! When performing UFS chip programming, FRP bypass, Remove MDM Lock, Remove user lock, Recover data or repair dead boot, the ISP pinouts are the first and most important step.

As mobile technicians, we often deal with bricked, locked, and not detected devices; this is where an ISP connection directly to the UFS chip is required. In this article, I will provide you with the verified ISP pinout for Samsung Galaxy S25 SM-S931B that I have personally verified, what it is, and how it can be used safely for repair and recovery purposes.

What is Vivo Y29S ISP Pinout?

ISP (In-System Programming) pinout helps you to connect directly to the UFS memory chip of a mobile phone. This helps in reading and writing data using tools like Easy JTAG, UFI, or CM2 without removing the chip from the motherboard.

Samsung Galaxy S25 SM-S931B UFS ISP Pinout Connection

Here’s a working image of the Samsung Galaxy S25 SM-S931B motherboard with the ISP pinout clearly labelled :

Pinout Labels:

RXOP – Receive Out Positive

RXON – Receive Out Negative

RST – Reset

TXOP – Transmit Out Positive

TXON – Transmit Out Negative

How to Connect the ISP to the Box

1. Remove the battery from the phone – extremely important to prevent voltage conflicts.
2. Clean the PC board area using isopropyl alcohol.
3. Connect jumper wires to CLK, TXON, TXOP, GND, and RXON, RXOP with care using solder.
4. Connect the wires to your UFS, EMMC tool, following the tool’s pinout.

1. Double-check each wire using a multimeter to ensure there are no shorts.
2. Connect to UFI or Easy JTAG,
3. In the UFI or Easy Jtag Software:
4. Select Identify UFS eMMC
5. 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.

Tips for Mobile Technicians

• Use a good microscope and fine soldering tools.
• If you’re new to ISP, don’t rush—practice on scrap boards first.
• Always double-check pin connections before powering the tool.
• Document or snap a picture of your wiring for future reference.

When Do You Need the ISP Pinout for Samsung Galaxy S25?

• If you need to unlock FRP, and standard methods do not work
• When the device is dead and not detected by the PC (EDL not working)
• For reading or writing firmware directly to UFS
• In cases of user data extraction or dead boot repair

That’s it!
With these Samsung Galaxy S25 5G ISP pinouts, you can easily perform UFS operations for repair or data work. For more ISP pinouts and mobile repair tips, keep visiting our blog!