Remove the battery from the phone—this is extremely important to prevent voltage conflicts.
Clean the PC board area with isopropyl alcohol.
Connect jumper wires to Rst, Txop, Txon, Rxop, and Rxon points with care using solder.
Connect the wires to your UFS/EMMC tool according to 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 EMMC chip information in the tool window.
You can easily get the UFS ISP PinOUT connection of the Vivo y39 by following the full guide below, along with images. By using the ISP PinOUT, you can easily restore the stock ROM, bypass the FRP lock, or reset user data on your device via the UFi Box. In this guide, we will also guide you on how to reboot download mode.
In this post, I’ll walk you through the ISP pinout for the Vivo Y39, what tools you’ll need, connection tips, and common fixes—all based on hands-on experience.
What is ISP pinout?
In simple terms, ISP allows you to access the UFS chip without having to remove it. You simply have to identify the appropriate pinout of the board, and you have to utilize a supported EMMC/UFS tool such as UFI, Easy JTAG, or Medusa Pro to attach it directly.
The 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
The phone is detected as “unknown” in PC (EDL not working)
Vivo Y39 5G ISP Pinout EMMC Ways Image:
Here’s where things get technical. The Vivo y39 shares a hardware layout with several BBK 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:Rst (Reset)
Txop (Transmit Data Positive)
Txon (Transmit Data Negative)
Rxop (Receive Data Positive)
Rxon (Receive Data Negative)
GND (Ground – Connect to any ground point)
💡 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 Vivo y39, 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:
💡 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 Vivo y39, 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:
