Do you experience difficulties in flashing your Samsung S25 Ultra or removing an FRP lock? ISP Pinout for Samsung S25 Ultra SM-S938B. ISP Pinout can help you in this situation. You can face problems while flashing stock firmware, removing locks, or bypassing factory reset protection using any tool.
Resetting the Samsung S25 Ultra user lock, writing a UFS dump, and erasing the MDM lock are all possible with the help of this pinout. You can find the Samsung S25 Ultra (SM-S938B) UFS ISP Pinout and how to use it here.
⚙️ What is ISP (In-System Programming)?
In simple language, ISP lets you access the EMMC chip without pulling it out. You simply have to identify the appropriate pinout of the board, and you have to utilize a supported 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 S25 Ultra SM-S938B ISP EMMC Pinout Image:
- First, take your phone’s back cover off. Then, remove the battery, fingerprint reader, and camera from the motherboard.
- Unscrew the screws that hold the motherboard in place, carefully remove it, and put it in a safe place.
- Find the TxOp, TxOn, RxOp, and RxOn pins for the eMMC on the device. You might have to cut through the steel cover to get to them.
- Get the UFI box, then take the adapter out of it. The pins on the adapter should be the same as the ones listed in the last step.
- Between the base and the adapter, use jumpers to connect the four pins (TxOp, TxOn, RxOp, and RxOn). Leave the USB to power the VCC and VCCQ.
- Put the connector into the UFI box and connect the box to your computer.
- Connect the battery to the computer again. Then, connect the phone to your computer using the USB connection.
When repairing dead boot problems, especially for devices like the Samsung S25 Ultra SM-S938B, 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)
Connect the UFI Box
- Insert the UFS ISP adapter into the UFI Box
- Connect the UFI Box to your PC using USB
- Launch the UFI Software
- Navigate to UFS Tool Box
- Select ISP Mode
🛑 Tips & Precautions
- Always work on an ESD-safe surface
- Avoid forcing jumpers — use magnification and a steady hand
- Backup data before making changes
- Double-check pinouts before applying power
