Samsung SM-A30S (A307) ISP Pinout Overview

The Samsung SM-A30S, also known by its model number A307, is powered by the Samsung Exynos 7904 octa-core processor and ships with an eMMC 5.1 flash storage chip. For technicians performing ISP (In-System Programming) operations — including FRP bypass, firmware reading, and dead-boot recovery — direct access to the eMMC via test pads on the PCB is required when conventional USB flashing is not possible.

When to Use ISP

ISP access is necessary in the following scenarios:

  • The device is stuck in a boot loop and does not respond to standard download mode.
  • FRP (Factory Reset Protection) lock prevents access after a hard reset.
  • The USB port is damaged or non-functional.
  • The device shows a black screen (dead boot) after a failed firmware flash.

ISP Test Pad Locations

The ISP pads for the SM-A30S are located on the rear side of the main PCB. Careful disassembly is required: remove the back cover, battery, and unscrew the motherboard. The eMMC test pads are typically found near the eMMC chip itself. Use a high-magnification microscope or loupe to identify the pads before soldering.

Note: The exact pad coordinates (silkscreen labels or measured XY positions) for this model have not been independently verified in our database. Technicians are advised to cross-reference with a reliable board-view file or schematic before proceeding. Pad locations listed below are based on community-reported references and should be confirmed prior to use.

Required ISP Pins (eMMC Interface)

  • CLK – eMMC clock signal
  • CMD – eMMC command line
  • DAT0 – eMMC data line (minimum required for ISP mode)
  • VCC – eMMC core power supply (typically 3.3 V)
  • VCCQ – eMMC I/O power supply (typically 1.8 V)
  • GND – Ground reference

Procedure Summary

1. Fully disassemble the device and expose the main PCB.
2. Identify and solder fine wire connections to the CLK, CMD, DAT0, VCC, VCCQ, and GND pads.
3. Connect the wires to your ISP adapter or compatible box tool.
4. Launch your ISP tool software, select the SM-A30S or Exynos 7904 profile, and apply 1.8 V VCCQ / 3.3 V VCC.
5. Power on the adapter only — do not insert the device battery during ISP operation.
6. Execute the desired operation: read, write, or erase.

Supported Tools

The following tools are known to support ISP operations on the SM-A30S eMMC chip:

  • Easy-JTAG Plus (Z3X) with eMMC ISP adapter
  • UMT (Ultimate Multi Tool) ISP mode
  • Medusa Pro II
  • RIFF Box 2

Voltage Warning

Always verify voltages before powering on. Applying incorrect voltage to the eMMC pads — especially confusing VCC (3.3 V) and VCCQ (1.8 V) — can permanently damage the eMMC chip or surrounding components. Do not connect the device battery during ISP access.

Pin / Test Point Reference

PinDescription
CLKeMMC clock signal test pad — Exact PCB pad location unverified — confirm with board-view schematic
CMDeMMC command line test pad — Exact PCB pad location unverified — confirm with board-view schematic
DAT0eMMC data line 0 — minimum required for ISP read/write — Exact PCB pad location unverified — confirm with board-view schematic
VCCeMMC core power supply — 3.3 V — Do not confuse with VCCQ
VCCQeMMC I/O power supply — 1.8 V — Apply 1.8 V only; overvoltage will damage eMMC
GNDGround reference — connect to device ground plane

Tools required: Easy-JTAG Plus (Z3X) with eMMC ISP adapter, UMT (Ultimate Multi Tool), Medusa Pro II, RIFF Box 2, Fine-tip soldering iron (0.2 mm tip recommended), Digital multimeter (for voltage verification), Microscope or magnification loupe

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

⚠ Safety note: Verify VCC (3.3 V) and VCCQ (1.8 V) before powering on. Do not insert the battery during ISP access. Incorrect voltage will permanently damage the eMMC. Confirm pad locations with a board-view file before soldering.