⚠️ Alternative points: On some PCB revisions, these points are located near the CPU (MT6762) instead. Look for a cluster of 5-6 small vias without solder mask.
ISP (In-System Programming) allows direct communication with the eMMC chip via test points on the motherboard without desoldering the chip. You need three critical lines:
If the specific "paper" pinout for your specific board revision is not matching, you can find the ISP points manually using a multimeter and the schematic of the EMMC chip (usually a Samsung chip like KMKGW001M or similar): lg k41s isp pinout new
Based on hardware analysis of revision 1.0 PCB.
| Signal | Test Point Label / Location | Color Code (Typical) | | :--- | :--- | :--- | | CLK | TP501 (Near eMMC, next to a small resistor) | White wire | | CMD | TP502 (Adjacent to CLK point) | Yellow wire | | D0 | TP503 (Third point in the same row) | Orange wire | | GND | Any large copper area / Shielded can / TP500 | Black wire | | VCC (eMMC) | Do not connect directly – use phone battery or DC supply at 3.3V - 3.7V via battery connector (+) | Red wire (Battery+) | ⚠️ Alternative points: On some PCB revisions, these
Apply flux, tin the test points, and solder thin wires (max 3cm length). For DAT0, solder to the positive side of resistor R131 (near the EMMC). Solder ground to any unpopulated screw hole.
Remove the graphite sheets and metal shields. Using a multimeter in continuity mode, verify TP907 connects to EMMC pin K3 (CLK) and TP908 connects to pin L3 (CMD). The "new" pinout provided below has been tested
Many online resources still show pinouts for the LG K41 (non-S) or older LG models. However, the LG K41S uses a different PCB revision with a relocated EMMC (embedded MultiMediaCard) chip. Using an outdated pinout can result in:
The "new" pinout provided below has been tested on firmware V10e, V11a, and V12b across both K410HM and K420HM variants.