Samsung SM-A8S (G887) ISP Pinout Download 2026

What Is ISP Pinout

ISP (In-System Programming) is a direct hardware access method that allows technicians to communicate with a device's NAND flash memory without relying on the phone's processor or software stack. For the Samsung SM-A8S (G887), this technique is essential when conventional software-based approaches — such as USB-based flashing via Odin or EDL mode — are unavailable due to a corrupted bootloader, locked bootloader state, or unresponsive system partition. By connecting directly to the UFS memory's dedicated test pads on the PCB, a compatible box or adapter can read, write, or erase flash memory sectors at the hardware level, bypassing all software restrictions entirely.

SM-A8S ISP Test Points

The SM-A8S (G887) uses a Qualcomm Snapdragon 710 platform with UFS 2.1 flash storage. The ISP test points are located on the rear side of the main PCB, typically clustered near the UFS memory chip. The standard UFS ISP pinout for this platform includes the following signals:

• CLK — UFS reference clock signal
• CMD — Command line (differential pair: REFCLKP/REFCLKN on UFS)
• DAT0 — Data lane (UFS uses differential data lanes: TX+/TX−, RX+/RX−)
• VCC — Main flash supply voltage (2.9V–3.0V)
• VCCQ — I/O supply voltage for UFS interface (1.8V)
• GND — Ground reference

Exact pad coordinates on the G887 PCB are not definitively confirmed in public documentation and should be verified visually using a schematic or by probing under magnification before connection.

When To Use This Method

The ISP method on the SM-A8S is appropriate in the following scenarios: the device fails to power on (dead boot) after a failed firmware flash or corrupted system image; FRP (Factory Reset Protection) lock cannot be resolved through ADB, download mode, or recovery; EDL (Emergency Download) mode is inaccessible due to bootloader damage or hardware fault; and the USB port is physically damaged, preventing standard cable-based communication. This method is a last-resort hardware solution and should only be attempted after exhausting all software-based options.

Accessing The Test Points

To connect to the SM-A8S ISP test points, follow this procedure:

• Power off the device completely and disconnect the battery.
• Disassemble the rear housing and carefully remove the PCB.
• Identify the UFS test pads using a schematic reference or magnification tool.
• Solder fine-gauge ISP wires or use a dedicated ISP pogo-pin adapter to each pad: CLK, CMD, DAT0/DAT1, VCC, VCCQ, and GND.
• Connect the wired harness to a compatible ISP box (e.g., Easy-JTAG Plus with UFS adapter, UFi Box, or Medusa Pro II).
• Launch the software, select the SM-A8S or Snapdragon 710 UFS profile, and initiate the desired operation (read, erase, or write).

Safety Warnings and Tips

Working on the SM-A8S PCB at the ISP level carries significant risk. Always observe the following precautions:

• Supply exactly 1.8V for VCCQ and 2.9V–3.0V for VCC — overvoltage will permanently damage the UFS chip.
• Never apply power through the battery while ISP wires are connected.
• Use flux and a fine-tip soldering iron to avoid bridging adjacent pads.
• Always back up the full UFS image before performing any erase or write operation.
• Confirm pad identity with a multimeter in continuity mode before powering on.
• Work in a static-safe environment using an ESD mat and wrist strap.

Pin / Test Point Reference

Tools required: Easy-JTAG Plus with UFS Adapter, UFi Box, Medusa Pro II, Octoplus / Octopus Box, Fine-tip soldering iron and ISP wire, Pogo-pin ISP adapter (if available for G887), Multimeter, ESD mat and wrist strap

Supported operations: Read Firmware / Full UFS Dump, FRP Erase, Dead Boot Repair, IMEI Repair (subject to local laws), Bootloader Unlock Data Erase, Write Firmware

⚠ Safety note: Use 1.8V VCCQ and 2.9–3.0V VCC only. Overvoltage destroys UFS. Disconnect battery before ISP connection. Always backup before erase/write.