When the K41S is soft-bricked, has a corrupt security partition, or has FRP locked on a forgotten Google account, USB communication often fails. The phone bootloops, or the preloader disconnects after 3 seconds.
Note: Exact pad labels can vary by board revision. On many K41S boards the pads are grouped near the eMMC chip; DAT0/CMD/CLK are adjacent pads, with VCC and GND slightly offset. Use a multimeter to confirm continuity to known eMMC pins before powering. lg k41s isp pinout better
Once connected, do not just write a new firmware. Follow this order: When the K41S is soft-bricked, has a corrupt