Vivo S1 Pro Test Point Overview
The Vivo S1 Pro (released 2019) is powered by the Qualcomm Snapdragon 665 (SM6125) chipset and runs on an eMMC 5.1 storage configuration. Like most modern Vivo devices, it supports Qualcomm's Emergency Download Mode (EDL / 9008 mode), which is the primary pathway for flashing firmware, bypassing FRP locks, and recovering from dead-boot situations. Knowing the correct test point location allows technicians to force the device into EDL mode when software-based methods fail.
When to Use the Test Point
- FRP (Factory Reset Protection) Bypass: When the device is locked to a Google account after a hard reset and cannot be bypassed via standard ADB or fastboot methods.
- Dead Boot Recovery: When the device fails to power on due to a corrupt bootloader or failed OTA update.
- Firmware Flashing: When the device cannot be detected by flashing tools through normal USB connection.
- IMEI Repair / Partition Restore: Advanced repairs requiring direct eMMC ISP access when EDL is unavailable.
Entering EDL Mode via Test Point
The Vivo S1 Pro can be forced into Qualcomm EDL (9008) mode by shorting a specific test point on the motherboard. Follow these steps carefully:
- Power off the device completely and disconnect the battery.
- Disassemble the rear panel and locate the motherboard. Remove any shielding covers as necessary.
- Identify the EDL test point pad — located near the Snapdragon 665 SoC on the motherboard (exact pad position varies; refer to a verified board-level schematic for your PCB revision).
- While shorting the test point to GND with a metal tweezer or jumper wire, connect the device to a PC via USB.
- Release the short once the device is detected. In Device Manager (Windows), it should appear as Qualcomm HS-USB QDLoader 9008.
- Launch your flashing or FRP tool and proceed with the required operation.
ISP eMMC Pinout (Direct ISP Method)
If EDL mode is inaccessible, technicians may use the ISP (In-System Programming) method to interface directly with the eMMC chip. The standard ISP pads for the Vivo S1 Pro are located on the back of the motherboard. Use a verified ISP pinout diagram for your specific PCB batch before soldering.
Required Precautions
Always disconnect the battery before shorting any test points. Use a regulated power supply if re-connecting power externally. Ensure ESD protection is in place before handling the PCB. Using incorrect voltage levels on eMMC ISP pads can permanently damage the storage IC. Confirm your tool's voltage settings before proceeding.
Compatible Tools
Most professional box solutions support the Vivo S1 Pro via EDL mode. For ISP operations, a socket-based programmer is recommended to avoid pad damage from repeated soldering.
Pin / Test Point Reference
| Pin | Description |
|---|---|
| EDL Test Point | Short to GND while connecting USB to force Qualcomm 9008 EDL mode — Exact pad location varies by PCB revision; verify against board schematic before use |
| CLK | eMMC clock line — ISP pad on motherboard — Exact coordinates not confirmed; verify with ISP pinout diagram |
| CMD | eMMC command line — ISP pad on motherboard — Exact coordinates not confirmed |
| DAT0 | eMMC data line 0 — ISP pad on motherboard — Exact coordinates not confirmed |
| VCC | eMMC power supply — 3.3V — Confirm voltage before connecting |
| VCCQ | eMMC I/O voltage — 1.8V — Confirm voltage before connecting |
| GND | Common ground reference for all ISP and EDL operations |
Tools required: Qualcomm EDL / QFIL, UMT (Ultimate Multi Tool), Medusa Pro II, EasyJTAG Plus, Hydra Tool, UFi Box (ISP), RIFF Box 2 (ISP)
Supported operations: FRP Erase, Dead Boot Repair, Firmware Flashing, Read Firmware, IMEI Repair, Partition Restore, ISP eMMC Read/Write
⚠ Safety note: Disconnect battery before shorting test points. Verify eMMC VCC (3.3V) and VCCQ (1.8V) before ISP connection. Incorrect voltage will permanently damage the eMMC IC. Use ESD protection at all times.
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