Samsung SM-A34 5G (A346) ISP Pinout Download 2026

What Is ISP Pinout

ISP (In-System Programming) pinout is a direct hardware method that allows technicians to communicate with the eMMC or UFS storage chip on a device motherboard without relying on the CPU, bootloader, or USB interface. On the Samsung SM-A346 5G (Galaxy A34), this technique involves identifying and connecting to dedicated test pads on the PCB that expose the raw storage bus signals — typically CLK, CMD, DAT0, VCC, VCCQ, and GND. Once connected, a compatible programmer reads or writes to the storage chip directly, enabling operations that are otherwise blocked by software locks or boot failures.

When Technicians Use ISP

ISP access on the SM-A346 becomes necessary in several critical repair scenarios:

• Dead Boot / Brick: The device will not power on or get stuck in a boot loop after a failed OTA update or interrupted flash attempt.
• FRP Lock: Google Factory Reset Protection is active and cannot be bypassed through conventional software methods.
• Corrupted Storage: The UFS storage has a damaged partition table or corrupted bootloader preventing normal USB communication.
• IMEI Repair: The device EFS partition is damaged and the modem cannot register on a network.
• Pattern / PIN Lock: The device is locked and no software unlock path is available.

SM-A346 ISP Test Points

The SM-A346 uses a UFS 2.2 storage interface, which differs from legacy eMMC pinouts. The ISP pads are located on the underside of the main motherboard, typically near the UFS storage chip. The key signal pads are as follows:

• CLK – UFS reference clock line
• CMD / RESET – Command and reset control line
• DAT0 – Primary data line
• VCC – Main storage supply voltage (nominally 2.9V–3.0V)
• VCCQ – I/O supply voltage (nominally 1.8V)
• GND – Common ground reference

Note: Exact pad coordinates and silk-screen labels for the SM-A346 have not been independently verified in publicly available schematics. Technicians should cross-reference with a trusted ISP pad diagram or use a multimeter to confirm each pad before connecting.

How to Access the Pads

Follow this procedure carefully to connect ISP wires to the SM-A346 motherboard:

• Power off the device completely and disconnect the battery.
• Remove the motherboard from the chassis and clean the target pad area with isopropyl alcohol (99%).
• Using a temperature-controlled soldering iron set to 300–320°C, tin each test pad lightly with flux and fine solder.
• Solder thin gauge enamelled wire (0.1mm recommended) to each pad — CLK, CMD, DAT0, VCC, VCCQ, and GND.
• Connect the wires to the corresponding ISP socket on your programmer (e.g. EasyJTAG Plus or UMT ISP adapter).
• Launch the programmer software, select the SM-A346 or MT6877 profile, and initiate your desired operation.

Safety Tips and Warnings

Incorrect ISP connections can permanently destroy the UFS chip or motherboard power rails. Observe the following precautions:

• Never apply more than 3.3V to VCC or 1.8V to VCCQ — overvoltage will kill the storage chip instantly.
• Double-check GND continuity before powering the programmer.
• Do not bridge adjacent pads — use a microscope or magnifier when soldering.
• Avoid excessive heat on any single pad; limit iron contact to under 3 seconds per touch.
• Always back up firmware before writing or erasing any partition.
• Use only ISP-rated programmers with current limiting to avoid rail damage.

Pin / Test Point Reference

Tools required: EasyJTAG Plus with ISP adapter, UMT (Ultimate Multi Tool) with ISP box, Medusa Pro II, Temperature-controlled soldering iron (300–320°C), Flux and fine solder (0.3mm or less), 0.1mm enamelled copper wire, Isopropyl alcohol 99%, Digital multimeter, Microscope or magnifier

Supported operations: Read Firmware, Write Firmware, FRP Erase, Dead Boot Repair, IMEI Repair (EFS restore), Pattern/PIN Lock Remove, Partition Backup

⚠ Safety note: Do not exceed 3.0V on VCC or 1.8V on VCCQ. Verify all pads with a multimeter before connecting. Incorrect pinout will permanently damage the UFS chip.