Here, we give you the UFS ISP pinout of the Samsung Galaxy S23 Ultra 5G (SM-S918B) mainboard that you can utilize in order to place it under EDL mode or perform dead boot repair, frp unlock, firmware flash, or data recover with Easy JTAG, UFI, or Hydra.
In this post, I’ll walk you through the ISP PinOUT for the Samsung S23 Ultra SM-S918B what tools you’ll need, connection tips, and common fixes—all based on hands-on experience.
⚙️ What is ISP (In-System Programming)?
In simple terms, ISP allows you to access the EMMC chip without having to remove it. You simply have to identify the appropriate pinout of the board, and you have to 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 S23 Ultra SM-S918B UFS ISP Pinout Image:
Here’s where things get technical. The Samsung S23 Ultra SM-S918B 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:
CLK
TXOP
TXON
RXOP
RXON
GND – Ground
💡 Tip: Use a microscope or a 10x magnifier to identify the points correctly. Don’t rely on diagrams alone—confirm the layout visually.
When repairing dead boot problems, especially for devices like the Samsung S23 Ultra SM-S918B, 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 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 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 UFS chip information in the tool window.
