Samsung Galaxy A31 (SM-A315) ISP Pinout Overview

The Samsung Galaxy A31 (SM-A315F / SM-A315G) is powered by the MediaTek Helio P65 (MT6768) SoC and uses an eMMC 5.1 storage interface. For technicians performing FRP unlock, dead-boot repair, or full firmware read/write operations without using the USB port, direct ISP (In-System Programming) access via the eMMC test pads on the motherboard is the reliable method of choice.

ISP Test Pad Location

The ISP pads on the SM-A315 PCB are located on the back side of the motherboard, grouped near the eMMC chip. The board must be removed from the chassis and inspected under magnification. Pads are small and require precision soldering or a dedicated ISP adapter/clamp compatible with the A31 pinout. Clean the board thoroughly before attaching wires or a pogo-pin fixture.

Required ISP Pins

The standard eMMC ISP interface uses the following signals. Solder fine-gauge wire-wrap wire (30 AWG) or use a compatible ISP clamp to make contact with the following pads:

  • CLK – eMMC Clock signal
  • CMD – Command line
  • DAT0 – Data line 0 (primary data transfer line for ISP mode)
  • VCC – eMMC core power supply (2.9V – 3.3V)
  • VCCQ – eMMC I/O power supply (1.8V)
  • GND – Ground reference

Note: DAT1–DAT7 and RST pads are present on the eMMC package but are not required for basic ISP read/write operations using standard box software in x1 bus-width mode.

Supported Operations

Once ISP connection is established and recognized by your tool software, the following operations are typically supported:

  • Full eMMC firmware read (backup)
  • Full eMMC firmware write/restore
  • FRP (Factory Reset Protection) erase
  • Dead-boot repair (re-flashing corrupted bootloader)
  • IMEI area read (for reference; writing IMEI requires compliance with local regulations)

Procedure Notes

Before connecting ISP wires, ensure the device battery is disconnected. Supply regulated power via your ISP tool's power output — do not use the device battery during ISP operations, as voltage fluctuations can corrupt the eMMC. Set your tool to eMMC 5.1 / HS200 mode. Use the MediaTek eMMC ISP pinout profile if your software requires manual configuration. After a successful read, always verify the backup file size matches the declared eMMC capacity before proceeding with any write operation.

Compatible Tools

The SM-A315 ISP pinout is supported by several professional repair tools including Easy-JTAG Plus, UMT (Ultimate Multi Tool), UFi Box, Medusa Pro II, and RIFF Box 2. Ensure your tool's firmware and software are updated to the latest version for full MT6768 eMMC ISP compatibility.

Pin / Test Point Reference

PinDescription
CLKeMMC clock signal test pad — Required for all ISP operations
CMDeMMC command line test pad — Required for all ISP operations
DAT0eMMC data line 0 test pad — Minimum data line needed for x1 mode ISP
VCCeMMC core power supply pad (2.9V–3.3V) — Supply via ISP tool; disconnect battery first
VCCQeMMC I/O power supply pad (1.8V) — Must be stable at 1.8V; verify with multimeter
GNDGround reference pad — Connect to tool GND

Tools required: Easy-JTAG Plus, UMT (Ultimate Multi Tool), UFi Box, Medusa Pro II, RIFF Box 2

Supported operations: Read Firmware (eMMC Backup), Write Firmware (eMMC Restore), FRP Erase, Dead Boot Repair, IMEI Read

⚠ Safety note: Disconnect battery before ISP connection. Supply VCC at 2.9–3.3V and VCCQ at 1.8V only via regulated ISP tool output. Incorrect voltage WILL permanently damage the eMMC. Verify all connections before powering on.