OPPO A5S CPH1909 Test Point Overview

The OPPO A5S (model CPH1909) is a budget Android smartphone powered by the MediaTek Helio P35 (MT6765) chipset. When the device suffers a dead boot, a locked bootloader situation, or a failed firmware update, technicians rely on the hardware test point (ISP eMMC) method to restore the device or erase FRP (Factory Reset Protection) directly at the chip level, bypassing normal boot sequences entirely.

When to Use the Test Point Method

  • Device powers on but is stuck in a boot loop or on the OPPO logo.
  • Soft FRP removal via ADB or Recovery has failed.
  • Device is completely dead and does not respond to USB detection in SP Flash Tool or MiFlash.
  • eMMC needs to be read, backed up, or written using ISP (In-System Programming) mode.
  • Firmware is corrupt and the bootloader cannot initialise.

Required Tools

To work with the OPPO A5S CPH1909 test points you will need a compatible ISP box or dongle such as UMT (Ultimate Multi Tool), EasyJTAG Plus, or Medusa Pro II. A fine-tip soldering iron or ISP clip/pogo-pin adapter, quality flux, and thin 30 AWG wire are also necessary. Always use a regulated bench power supply or a reliable USB power source during the procedure.

ISP eMMC Test Point Locations

The ISP pads on the OPPO A5S CPH1909 are located on the back side of the main PCB, near the eMMC chip. The standard MediaTek ISP pinout applies. After opening the device and removing the motherboard, identify the eMMC pads using the pinout below. Connect your ISP adapter leads carefully to each pad before powering the board.

  • CLK – eMMC Clock signal pad
  • CMD – eMMC Command pad
  • DAT0 – eMMC Data line 0
  • VCC – eMMC core voltage supply (2.9 V – 3.3 V)
  • VCCQ – eMMC I/O voltage (1.8 V)
  • GND – Common ground pad
  • RST – eMMC Reset pad (connect if required by your tool)

Note: Exact PCB pad coordinates and silk-screen labels vary between board revisions. Always verify pads with a multimeter in continuity mode before applying power.

Step Overview

  1. Power off and disassemble the device completely; disconnect the battery.
  2. Remove the motherboard and locate the eMMC ISP pads on the rear side of the PCB.
  3. Solder or clip your ISP adapter wires to CLK, CMD, DAT0, VCC, VCCQ, GND (and RST if needed).
  4. Connect the adapter to your ISP tool (UMT, EasyJTAG Plus, etc.) and launch the software.
  5. Select MediaTek MT6765 or use eMMC auto-detect. Power the board via the ISP tool's supply rail.
  6. Execute your desired operation: Read, FRP Erase, or Full Flash/Restore.
  7. After completion, disconnect safely, reassemble, and test the device.

Safety Notice

Never apply more than 3.3 V to the VCC rail or more than 1.8 V to VCCQ. Incorrect voltage will permanently damage the eMMC. Ensure the battery is fully disconnected before connecting ISP leads. Work in an ESD-safe environment at all times.

Pin / Test Point Reference

PinDescription
CLKeMMC Clock signal — connect to CLK pin on ISP adapter — Verify pad with oscilloscope if unsure
CMDeMMC Command line — connect to CMD pin on ISP adapter
DAT0eMMC Data line 0 — primary data pad for ISP single-wire mode
VCCeMMC core power supply pad — 2.9 V to 3.3 V — Do not exceed 3.3 V
VCCQeMMC I/O voltage pad — 1.8 V logic level — Do not exceed 1.8 V
GNDGround reference pad — common ground for all ISP signals
RSTeMMC Reset pad — connect if required by tool; can be left open on some tools — Optional depending on ISP box firmware

Tools required: UMT (Ultimate Multi Tool), EasyJTAG Plus, Medusa Pro II, SP Flash Tool (for software flash when device partially detected), Fine-tip soldering iron + flux, 30 AWG ISP wire or pogo-pin ISP adapter, Regulated bench power supply, Multimeter

Supported operations: FRP Erase, Dead Boot Repair, Read Firmware / eMMC Backup, Write / Restore Firmware, IMEI Repair (with licensed tool), Pattern / PIN Lock Remove

⚠ Safety note: Disconnect battery before connecting ISP leads. VCC must not exceed 3.3 V; VCCQ must not exceed 1.8 V. Incorrect voltage permanently damages the eMMC. Use ESD precautions throughout.