In this post, we will provide a Complete and tested Vivo Y21D PD2510F EMMC ISP pinout, which will be useful to advanced mobile repair technicians. The ISP pinout is extremely important when performing direct MEEC 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 EMMC Chip. In this post, we will present the tested and verified Vivo Y21D 5G ISP Pinout, what it is, and how to connect and easily do your repair and recovery tasks with it.
What is the Vivo Y21D PD2510F 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 utilise a supported EMMC tool, such as UFI, Easy JTAG, or Flash64, 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)
Vivo Y21D ISP Pinout Image:
Here’s where things get technical. The Vivo Y21D PD2510F shares a hardware layout with several models, but the actual pin locations can vary slightly. You’ll find the ISP points near the EMMC chip under the metal shield.
- CMD – Command line
- CLK – Clock signal
- DAT0 – Data line 0
- VCC / VCCQ – Power supply for the EMMC (can be powered via USB)
- GND – Ground connection
💡 Tip: Use a microscope or a 10x magnifier to identify the points correctly. Don’t rely solely on diagrams—confirm the layout visually.
To resolve dead boot issues on Vivo Y21D devices, the most effective tools for the job are the Flash64 and UFI boxes. These tools are designed for professional repairs, tackling cases where the phone keeps flashing during startup, does not display a boot logo, or fails to turn on at all. They provide full access to the phone’s inside and, therefore, enable the solution of problems that otherwise cannot be repaired. These are tools that every technician should have to address serious boot problems or more complex system issues.
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 Vivo Y21D ISP Pinout to the UFI 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, CMD, DAT0, GND, and VCC with care using solder.
- Connect the wires to your EMMC tool following the tool’s pinout.
- Double-check each wire using a multimeter to ensure there are no shorts.
- Turn on your EMMC tool and scan the chip in software.
✅ If you have the right connection, you will see the EMMC chip information in the tool window.
