Stk-l21 Isp Pinout -

After analyzing the motherboard (PCB model: HNova3i-L21-MB-V2), the ISP test points are located near the eMMC chip shield. They are TP (Test Point) pads, not on a traditional ISP break-out board.

If you are holding a dead Huawei STK-L21 (Enjoy 10e / Honor 9 Lite Pro) that won’t charge, won’t turn on, or is stuck in a boot loop, you have likely hit the dreaded "no download mode" wall.

You cannot flash it via USB if the CPU isn't communicating. So, what is the solution? ISP. stk-l21 isp pinout

In this post, I will walk you through the ISP Pinout for the STK-L21 and explain how to perform an ISP (In-System Programming) flash to bring this device back to life.

[ISP Programmer]          [Huawei STK-L21 Mainboard]
     CLK    -------------- TP3050 (or eMMC pin A5)
     CMD    -------------- TP3051 (or eMMC pin B4)
     D0     -------------- TP3052 (or eMMC pin B3)
     GND    -------------- Shield Ground

The STK-L21 dev board exposes programming pads or pins for the STM32L021F4P6. While manufacturer silk and schematics should be consulted for exact pad labels, the mapping follows STM32L0 reference pins: The STK-L21 dev board exposes programming pads or

On the STK-L21 these signals are often routed to a 4-pin or 6-pin programming header or to exposed test pads. Check the board silkscreen: look for markings like SWCLK, SWDIO, NRST, 3V3, or GND. If you have the STK-L21 schematic: verify connections to PA13/PA14 and the NRST net.

If the labeled TP3050-3052 are missing on your board revision: On the STK-L21 these signals are often routed

Before diving into the pinout, know your target:

Because the Kirin 710 uses a standard eMMC 5.1 interface, we can bypass the CPU and talk directly to the storage chip.