Jmmal10 Test Point Upd (2026)

Unlocking the JMMAL10: The Definitive Guide to Test Point EDL and UPD

Published by: Tech Repair Experts Difficulty Level: Advanced (Firmware Flashing & Hardware Manipulation)

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Hardware:

• JMMAL10 device (with battery charged at least 30% – if possible).
• A computer running Windows 7/10/11 (64-bit recommended).
• A high-quality USB data cable (charging-only cables will fail).
• Fine-point tweezers or a small wire (to short the test points).
• A small Phillips screwdriver (to open the device – yes, you need physical access to the motherboard).

A. Sensor Signal Refinement

• Issue: Previous logic identified intermittent signal drops at Test Point 10 (often associated with Exhaust Gas Recirculation (EGR) or Intake Air Temperature sensors).
• Update: The UPD introduces a "debounce" filter logic. Test points now average signals over a longer millisecond window (e.g., 100ms -> 250ms) to filter out electrical noise from vibration.

Step 6: Post-Flash Steps

1. Close the flashing tool.
2. Disconnect the USB cable.
3. Reassemble the phone (screws, mid-frame, back cover).
4. Hold the power button for 15-20 seconds. The phone should vibrate and boot to the setup screen.
5. If it boots to eRecovery, perform a "Wipe data/factory reset" from recovery.

Step 4: Short the Test Points

• Connect the USB cable to your PC (but NOT to the phone yet).
• Use tweezers to short (connect) the two test points together.
• While holding the short, plug the USB cable into the JMMAL10.

2. Test Point Location

On the SM-J510 motherboard:

| Reference | Description | |-----------|-------------| | TP+ (Vcc) | Not used for short | | Test Point 1 (TP1) | Small circular pad near EMI shield, close to eMMC chip | | Test Point 2 (GND) | Any ground screw hole or copper area | jmmal10 test point upd

Visual reference (from service manuals): TP1 is just above the eMMC (Samsung KLMAG2GEAC-B001), typically labeled TP_902 on some PCB revisions. Unlocking the JMMAL10: The Definitive Guide to Test

5. Risks

• Permanent short damage if incorrect pads used.
• Requires proper disassembly – warranty void.
• No user data recovery – only low-level repair.

Step 5: Trigger the Connection

• Release the tweezers after 1–2 seconds.
• The PC should make a “USB connect” sound, and SP Flash Tool will turn from gray to yellow or blue, indicating “Download DA 100%” .

3. Procedure for EDL Mode

1. Remove battery connector.
2. Locate TP1 and a GND point.
3. Short TP1 to GND using tweezers.
4. Keep shorted → connect USB cable to PC.
5. Release short after 2–3 seconds.
6. PC should detect Qualcomm HS-USB QDLoader 9008.