For simpler tasks like FRP removal that don't require full eMMC access, a single USB Test Point (shorting a point to GND) is often used to put the device into "HUAWEI USB COM 1.0" mode.
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To establish a connection, you must solder tiny wires to specific test points on the motherboard. The STK-L21 utilizes a standard EMMC configuration. You will need to connect the following signals: The data line used to transfer information. CMD: The command line that tells the chip what to do. CLK: The clock signal to synchronize data transfer. GND: Ground. VCC & VCCQ: Power lines. For simpler tasks like FRP removal that don't
If you aren’t comfortable with micro-soldering, send it to a pro. A slip of the iron can short VCC to GND and fry the CPU. The STK-L21 utilizes a standard EMMC configuration